{"id":1876,"date":"2026-10-20T08:51:52","date_gmt":"2026-10-20T08:51:52","guid":{"rendered":"https:\/\/laseristanbulclinic.com\/eye-tests-diagnostics\/corneal-topography\/"},"modified":"2026-10-20T12:57:42","modified_gmt":"2026-10-20T12:57:42","slug":"corneal-topography","status":"publish","type":"page","link":"https:\/\/laseristanbulclinic.com\/en\/eye-tests-diagnostics\/corneal-topography\/","title":{"rendered":"Corneal topography"},"content":{"rendered":"<!-- Hero (Photo + summary card) Start -->\n<section class=\"page-hero\" id=\"top\">\n\t<div class=\"phero-inner pad with-media container-fluid\"><div class=\"row\">\n\t\t<div class=\"phero-left col-12 col-lg-7\">\n\t\t\t<div data-hero-in><ol class=\"crumbs\" aria-label=\"Breadcrumb\"><li><a href=\"https:\/\/laseristanbulclinic.com\/en\/\">Home: eye surgery in Istanbul<\/a><\/li><li><a href=\"https:\/\/laseristanbulclinic.com\/en\/treatments\/\">All eye treatments<\/a><\/li><li><a href=\"https:\/\/laseristanbulclinic.com\/en\/eye-tests-diagnostics\/\">Eye examinations &#038; diagnostic tests<\/a><\/li><li><span aria-current=\"page\">Corneal topography<\/span><\/li><\/ol><\/div>\t\t\t<h1 class=\"t64 hero-title phero-title\" data-lines>Corneal Topography: The Map of Your Cornea Before Eye Surgery<\/h1>\n\t\t\t\t\t\t<p class=\"t22 phero-lead\" data-hero-in>Corneal topography is a quick, painless scan that maps the shape of your cornea, the clear window at the front of your eye. It is the first test your surgeon looks at before laser eye surgery, the key test for finding and following keratoconus, and an important part of planning lens and cataract surgery. At Laser Istanbul Clinic it is part of every pre-operative examination, and your surgeon reads the result with you.<\/p>\n\t\t\t\t\t\t<div class=\"phero-ctas\" data-hero-in><a class=\"pill pill-white\" href=\"https:\/\/laseristanbulclinic.com\/en\/free-consultation\/\"><span class=\"pill-dot\" aria-hidden=\"true\"><\/span><span class=\"pill-label\">Send us your scans for a free review<\/span><\/a><a class=\"pill pill-line\" href=\"https:\/\/wa.me\/90123456789\" target=\"_blank\" rel=\"noopener\"><span class=\"pill-dot\" aria-hidden=\"true\"><\/span><span class=\"pill-label\">WhatsApp us: +90 123 456 789<\/span><\/a><\/div><ul class=\"phero-meta\" data-hero-in><li><svg width=\"16\" height=\"16\" aria-hidden=\"true\"><use href=\"#i-check\"\/><\/svg>Medically reviewed by <span class=\"ph\">{{surgeon}}<\/span><\/li><li><svg width=\"16\" height=\"16\" aria-hidden=\"true\"><use href=\"#i-check\"\/><\/svg>Last reviewed <span class=\"ph\">{{date}}<\/span><\/li><\/ul>\t\t<\/div>\n\t\t<div class=\"phero-right has-media col-12 col-lg-5\">\n\t\t\t\t\t\t<figure class=\"phero-media\" data-hero-in><img decoding=\"async\" width=\"640\" height=\"640\" src=\"https:\/\/laseristanbulclinic.com\/wp-content\/uploads\/2026\/10\/eye-iris-illustration-dark-1024x1024.webp\" class=\"attachment-large size-large\" alt=\"Illustration of an iris on a dark background\" fetchpriority=\"high\" srcset=\"https:\/\/laseristanbulclinic.com\/wp-content\/uploads\/2026\/10\/eye-iris-illustration-dark-1024x1024.webp 1024w, https:\/\/laseristanbulclinic.com\/wp-content\/uploads\/2026\/10\/eye-iris-illustration-dark-300x300.webp 300w, https:\/\/laseristanbulclinic.com\/wp-content\/uploads\/2026\/10\/eye-iris-illustration-dark-150x150.webp 150w, https:\/\/laseristanbulclinic.com\/wp-content\/uploads\/2026\/10\/eye-iris-illustration-dark-768x768.webp 768w, https:\/\/laseristanbulclinic.com\/wp-content\/uploads\/2026\/10\/eye-iris-illustration-dark.webp 1400w\" sizes=\"(max-width: 640px) 100vw, 640px\" \/><\/figure>\n\t\t\t\t\t\t\t\t\t<div class=\"inshort\" data-hero-in><p>Corneal topography is a no-touch scan that maps the curvature of your cornea like a contour map of hills and valleys. Each scan takes a few seconds. It shows astigmatism, early keratoconus and irregular corneas that would make laser eye surgery unsafe, and it guides the laser and lens-power plan. Abnormal topography is the single most significant known risk factor for weakening of the cornea after LASIK.<\/p><\/div>\n\t\t\t\t\t<\/div>\n\t<\/div><\/div>\n<\/section>\n<!-- Hero (Photo + summary card) End -->\n\n\n<!-- Image + Text (Image left, text right) Start -->\n<section class=\"psec pad split-sec\" id=\"measures\"><div class=\"container-fluid px-0\"><div class=\"row g-0\"><div class=\"col-12\"><div class=\"split\"><div class=\"row\">\n\t\t<div class=\"split-media col-12 col-lg-6\" data-reveal><div class=\"media\" data-parallax><img loading=\"lazy\" decoding=\"async\" width=\"640\" height=\"800\" src=\"https:\/\/laseristanbulclinic.com\/wp-content\/uploads\/2026\/10\/corneal-topography-map-819x1024.webp\" class=\"attachment-large size-large\" alt=\"Corneal topography map\" sizes=\"auto, (max-width: 991px) 100vw, 50vw\" srcset=\"https:\/\/laseristanbulclinic.com\/wp-content\/uploads\/2026\/10\/corneal-topography-map-819x1024.webp 819w, https:\/\/laseristanbulclinic.com\/wp-content\/uploads\/2026\/10\/corneal-topography-map-240x300.webp 240w, https:\/\/laseristanbulclinic.com\/wp-content\/uploads\/2026\/10\/corneal-topography-map-768x960.webp 768w, https:\/\/laseristanbulclinic.com\/wp-content\/uploads\/2026\/10\/corneal-topography-map.webp 1200w\" \/><\/div><\/div>\n\t\t<div class=\"split-copy col-12 col-lg-6\">\n\t\t\t\t<p class=\"eyebrow\" data-reveal>What corneal topography measures<\/p>\n\t\t\t\t\t\t<h2 class=\"t48\" data-reveal>A contour map of the front of your eye<\/h2>\n\t\t\t\t\t\t\t\t<div class=\"prose\" data-reveal><p>Your cornea provides about two-thirds of your eye&#8217;s focusing power, so tiny differences in its shape change how clearly you see. A normal cornea is smooth and slightly flatter towards the edge. Corneal topography measures that shape point by point and turns it into colour maps.<\/p><\/div>\n\t\t\t\t\t\t<ul class=\"check-list\" data-stagger>\n\t\t\t\t\t\t<li><svg width=\"22\" height=\"22\" aria-hidden=\"true\"><use href=\"#i-check\"\/><\/svg><span class=\"t22\"><strong>Curvature and power<\/strong> of the front surface, in dioptres, across the whole cornea, not just the centre<\/span><\/li>\n\t\t\t\t\t\t<li><svg width=\"22\" height=\"22\" aria-hidden=\"true\"><use href=\"#i-check\"\/><\/svg><span class=\"t22\"><strong>Astigmatism<\/strong>: how much, at what angle, and whether it is regular (symmetrical) or irregular<\/span><\/li>\n\t\t\t\t\t\t<li><svg width=\"22\" height=\"22\" aria-hidden=\"true\"><use href=\"#i-check\"\/><\/svg><span class=\"t22\"><strong>Elevation<\/strong>: areas that sit higher or lower than a perfect reference shape<\/span><\/li>\n\t\t\t\t\t\t<li><svg width=\"22\" height=\"22\" aria-hidden=\"true\"><use href=\"#i-check\"\/><\/svg><span class=\"t22\"><strong>Thickness (pachymetry)<\/strong> at every point, including the thinnest point, on tomography devices<\/span><\/li>\n\t\t\t\t\t\t<li><svg width=\"22\" height=\"22\" aria-hidden=\"true\"><use href=\"#i-check\"\/><\/svg><span class=\"t22\"><strong>The back surface<\/strong> of the cornea, also on tomography devices, where early keratoconus often shows first<\/span><\/li>\n\t\t\t\t\t<\/ul>\n\t\t\t\t\t\t\t\t\t<\/div>\n<\/div><\/div><\/div><\/div><\/div><\/section>\n<!-- Image + Text (Image left, text right) End -->\n\n\n<!-- Flexible Section Start -->\n<section class=\"panel\"><div class=\"container-fluid px-0\"><div class=\"row g-0\"><div class=\"col-12\"><h2 class=\"t48 sec-title\" data-reveal>Topography or tomography? Placido or Pentacam?<\/h2><p class=\"t22 sec-lead\" data-reveal>You will see both words. Strictly, <em>topography<\/em> maps the front surface, while <em>tomography<\/em> builds a three-dimensional picture of the front surface, back surface and thickness. EyeWiki notes that topography is good at capturing the power of the front of the cornea, while the overall shape is best captured by tomography.<\/p><div class=\"tbl-wrap\" data-reveal><table class=\"tbl rsp\"><thead><tr><th scope=\"col\">Corneal topography machine type<\/th><th scope=\"col\">How it works<\/th><th scope=\"col\">What it measures<\/th><th scope=\"col\">Best for<\/th><\/tr><\/thead><tbody><tr><th scope=\"row\">Placido-disc topographer<\/th><td data-label=\"How it works\">Projects illuminated concentric rings onto the eye and photographs their reflection from the tear film<\/td><td data-label=\"What it measures\">Front-surface curvature and power<\/td><td data-label=\"Best for\">Astigmatism, contact-lens fitting, surface regularity<\/td><\/tr><tr><th scope=\"row\">Rotating Scheimpflug camera (e.g. Pentacam)<\/th><td data-label=\"How it works\">A rotating camera and slit of blue light capture up to 25 slit images in under two seconds, with up to 25,000 data points<\/td><td data-label=\"What it measures\">Front and back surfaces, thickness map, 3D model of the front of the eye<\/td><td data-label=\"Best for\">Screening for early keratoconus and laser safety<\/td><\/tr><tr><th scope=\"row\">Scanning-slit and anterior-segment OCT systems<\/th><td data-label=\"How it works\">Light slits or optical coherence tomography scan across the cornea<\/td><td data-label=\"What it measures\">Front and back surfaces and thickness<\/td><td data-label=\"Best for\">Alternative tomography method<\/td><\/tr><\/tbody><\/table><\/div><div class=\"intro-grid row mt-v3\"><div class=\"intro-side col-12\"><p class=\"eyebrow\" data-reveal>In practice<\/p><\/div><div class=\"copy prose col-12\"><p data-reveal>So &#8220;corneal topography Pentacam&#8221; usually means a Scheimpflug tomography scan. According to EyeWiki, rotating Scheimpflug imaging currently gives the most useful information for spotting early weakening (ectasia) of the cornea.<\/p><div class=\"callout line\" data-reveal><p>Our examination uses <span class=\"ph\">{{topographer \/ tomographer models used by your surgeons}}<\/span>.<\/p><\/div><\/div><\/div><\/div><\/div><\/div><\/section>\n<!-- Flexible Section End -->\n\n\n<!-- Flexible Section Start -->\n<section class=\"psec pad\" id=\"why\"><div class=\"container-fluid px-0\"><div class=\"row g-0\"><div class=\"col-12\"><h2 class=\"t48 sec-title\" data-reveal>Why corneal topography is essential before laser eye surgery<\/h2><p class=\"t22 sec-lead\" data-reveal>Laser eye surgery removes a precise amount of corneal tissue. That is safe in a healthy cornea, and it can be harmful in a cornea that is already weak. The test exists to tell the two apart before any laser is used.<\/p><div class=\"features two row row-cols-1 row-cols-md-2\" data-stagger><div class=\"col\"><div class=\"feat h-100\"><span class=\"feat-icon\" aria-hidden=\"true\"><svg width=\"26\" height=\"26\" aria-hidden=\"true\"><use href=\"#i-shield\"\/><\/svg><\/span><h3>1. It screens out corneas at risk of ectasia<\/h3><p>The most feared complication of LASIK is ectasia, when a weakened cornea gradually bulges and vision distorts. EyeWiki describes abnormal corneal topography or tomography as &#8220;the single most significant identifiable risk factor&#8221; for ectasia after LASIK. It can reveal keratoconus and <em>forme fruste<\/em> (hidden) keratoconus that glasses tests and a normal eye examination miss. EyeWiki reports that Scheimpflug imaging and screening software have reduced ectasia to roughly 1 in 5,000 cases.<\/p><\/div><\/div><div class=\"col\"><div class=\"feat h-100\"><span class=\"feat-icon\" aria-hidden=\"true\"><svg width=\"26\" height=\"26\" aria-hidden=\"true\"><use href=\"#i-bolt\"\/><\/svg><\/span><h3>2. It decides which laser treatment is safe<\/h3><p>Together with corneal thickness, the scan shows how much tissue can be removed while leaving enough untouched cornea (at least 250 microns under a LASIK flap, with 300 preferred by many surgeons). If the margin is too small, your surgeon may suggest a surface treatment, SMILE Pro or an implantable lens instead of LASIK.<\/p><\/div><\/div><div class=\"col\"><div class=\"feat h-100\"><span class=\"feat-icon\" aria-hidden=\"true\"><svg width=\"26\" height=\"26\" aria-hidden=\"true\"><use href=\"#i-ruler\"\/><\/svg><\/span><h3>3. It plans the treatment itself<\/h3><p>The American Academy of Ophthalmology explains that topography helps the surgeon understand exactly how to reshape the cornea during refractive surgery.<\/p><\/div><\/div><div class=\"col\"><div class=\"feat h-100\"><span class=\"feat-icon\" aria-hidden=\"true\"><svg width=\"26\" height=\"26\" aria-hidden=\"true\"><use href=\"#i-clock\"\/><\/svg><\/span><h3>4. It checks that your cornea is stable<\/h3><p>Contact lenses, especially rigid and overnight orthokeratology lenses, temporarily change the corneal shape. EyeWiki advises that topography should be stable on two separate visits before final planning when lens-induced changes are suspected.<\/p><\/div><\/div><\/div><div class=\"mt-v2\"><blockquote class=\"quote\" data-reveal><p class=\"t32\">Before lens and cataract surgery, topography helps choose the right lens. It shows whether astigmatism is regular enough for a toric lens, whether the cornea suits a multifocal lens, and, in people who have had laser surgery in the past, gives a more accurate picture of corneal power than standard keratometry.<\/p><cite>The Royal College of Ophthalmologists also advises that anyone who has had laser vision correction tell their cataract surgeon, because it changes the lens-power calculation.<\/cite><\/blockquote><\/div><div class=\"mt-v2\" data-reveal><div class=\"links-row\"><a class=\"link-arrow\" href=\"https:\/\/laseristanbulclinic.com\/en\/laser-eye-surgery-turkey\/\">Laser eye surgery in Turkey: LASIK, SMILE Pro and PRK <svg width=\"18\" height=\"18\" aria-hidden=\"true\"><use href=\"#i-arrow\"\/><\/svg><\/a><a class=\"link-arrow\" href=\"https:\/\/laseristanbulclinic.com\/en\/lens-replacement-surgery-turkey\/\">Lens replacement surgery in Turkey <svg width=\"18\" height=\"18\" aria-hidden=\"true\"><use href=\"#i-arrow\"\/><\/svg><\/a><a class=\"link-arrow\" href=\"https:\/\/laseristanbulclinic.com\/en\/cataract-surgery-turkey\/\">Cataract surgery in Istanbul <svg width=\"18\" height=\"18\" aria-hidden=\"true\"><use href=\"#i-arrow\"\/><\/svg><\/a><a class=\"link-arrow\" href=\"https:\/\/laseristanbulclinic.com\/en\/icl-surgery-turkey\/\">ICL surgery in Turkey <svg width=\"18\" height=\"18\" aria-hidden=\"true\"><use href=\"#i-arrow\"\/><\/svg><\/a><\/div><\/div><\/div><\/div><\/div><\/section>\n<!-- Flexible Section End -->\n\n\n<!-- Flexible Section Start -->\n<section class=\"panel dark\" id=\"keratoconus\"><div class=\"container-fluid px-0\"><div class=\"row g-0\"><div class=\"col-12\"><div class=\"sec-head row\"><div class=\"col-12 col-lg-6\"><p class=\"eyebrow\" data-reveal>Corneal topography and keratoconus<\/p><h2 class=\"t48 sec-title\" data-reveal>The key test for finding and following keratoconus<\/h2><\/div><div class=\"col-12 col-lg-6\"><p class=\"t22 sec-lead\" data-reveal>Keratoconus is a condition in which the cornea gradually thins and bulges into a cone, causing blurred, distorted vision and irregular astigmatism. EyeWiki notes that its prevalence is often reported as 1 in 700, with considerably higher rates in the Middle East, India, China and Australia, and that it usually begins in adolescence and can progress into the mid-20s and 30s.<\/p><\/div><\/div><div class=\"features row row-cols-1 row-cols-md-2 row-cols-lg-3\" data-stagger><div class=\"col\"><div class=\"feat h-100\"><span class=\"feat-icon\" aria-hidden=\"true\"><svg width=\"26\" height=\"26\" aria-hidden=\"true\"><use href=\"#i-search\"\/><\/svg><\/span><h3>Diagnosis<\/h3><p>A review in <em>Community Eye Health<\/em> (2024) states that a definitive diagnosis of keratoconus is made with corneal topography and\/or tomography. Typical signs on the maps include steepening that is stronger in the lower half of the cornea (inferior steepening), an asymmetric &#8220;bow-tie&#8221; pattern or a skewed axis, and thinning and raised elevation in the same area, often seen first on the back surface.<\/p><\/div><\/div><div class=\"col\"><div class=\"feat h-100\"><span class=\"feat-icon\" aria-hidden=\"true\"><svg width=\"26\" height=\"26\" aria-hidden=\"true\"><use href=\"#i-calendar\"\/><\/svg><\/span><h3>Monitoring<\/h3><p>Keratoconus is followed with repeated scans, ideally on the same device. The same review suggests three consecutive scans per eye at each visit and monitoring every 6\u201312 months, or every 3 months in high-risk patients. An increase in corneal curvature of more than 1 dioptre, or thinning of more than 15 microns, may be considered significant.<\/p><\/div><\/div><div class=\"col\"><div class=\"feat h-100\"><span class=\"feat-icon\" aria-hidden=\"true\"><svg width=\"26\" height=\"26\" aria-hidden=\"true\"><use href=\"#i-badge\"\/><\/svg><\/span><h3>Deciding on treatment<\/h3><p>Corneal cross-linking strengthens the cornea to stop keratoconus getting worse. A Leeds Teaching Hospitals NHS Trust leaflet explains that it is most suitable for progressive keratoconus, including patients whose corneal topography maps show clear progression, and that it prevents further vision loss in about 95% of patients. Topography also guides corneal ring segments, specialist contact lenses and, in advanced cases, corneal transplantation.<\/p><\/div><\/div><\/div><div class=\"center-cta\" data-reveal><a class=\"pill pill-white\" href=\"https:\/\/laseristanbulclinic.com\/en\/keratoconus-treatment-turkey\/\"><span class=\"pill-dot\" aria-hidden=\"true\"><\/span><span class=\"pill-label\">Keratoconus treatment in Turkey<\/span><\/a><\/div><\/div><\/div><\/div><\/section>\n<!-- Flexible Section End -->\n\n\n<!-- Image + Text (Text left, image right) Start -->\n<section class=\"psec pad split-sec\" id=\"procedure\"><div class=\"container-fluid px-0\"><div class=\"row g-0\"><div class=\"col-12\"><div class=\"split rev\"><div class=\"row\">\n\t\t<div class=\"split-media col-12 col-lg-6\" data-reveal><div class=\"media tall\" data-parallax><img loading=\"lazy\" decoding=\"async\" width=\"603\" height=\"675\" src=\"https:\/\/laseristanbulclinic.com\/wp-content\/uploads\/2026\/10\/slit-lamp-eye-examination.webp\" class=\"attachment-large size-large\" alt=\"Eye examination at a slit lamp\" sizes=\"auto, (max-width: 991px) 100vw, 50vw\" srcset=\"https:\/\/laseristanbulclinic.com\/wp-content\/uploads\/2026\/10\/slit-lamp-eye-examination.webp 603w, https:\/\/laseristanbulclinic.com\/wp-content\/uploads\/2026\/10\/slit-lamp-eye-examination-268x300.webp 268w\" \/><\/div><\/div>\n\t\t<div class=\"split-copy col-12 col-lg-6\">\n\t\t\t\t<p class=\"eyebrow\" data-reveal>What to expect<\/p>\n\t\t\t\t\t\t<h2 class=\"t48\" data-reveal>The corneal topography procedure<\/h2>\n\t\t\t\t\t\t\t\t<div class=\"prose\" data-reveal><h3>Before the test<\/h3>\n<ul>\n<li><strong>Take a break from contact lenses<\/strong>, so your cornea returns to its natural shape. Typical advice is at least 1 week for soft lenses and 2 weeks or more for rigid lenses. Before a laser eye surgery assessment, the US FDA advises 2 weeks for soft lenses, 3 weeks for toric soft or rigid gas-permeable lenses and 4 weeks for hard lenses. Your coordinator will confirm the timing for your lenses.<\/li>\n<li><strong>Bring your glasses<\/strong>, your current prescription and any previous corneal scans. Earlier scans are especially valuable for keratoconus, because they show change over time.<\/li>\n<\/ul>\n<h3>During the test<\/h3>\n<ol>\n<li>You sit facing the machine with your chin and forehead resting on a support.<\/li>\n<li>You look at a fixed light or target inside the device and keep your eye open.<\/li>\n<li>The device captures the images. Nothing touches your eye, and there is no pain.<\/li>\n<li>The scan is usually repeated a few times for each eye to make sure the readings are consistent. A dry or uneven tear film can blur the map, so you may be asked to blink and try again.<\/li>\n<\/ol>\n<p><strong>How long does it take?<\/strong> The American Academy of Ophthalmology notes that each scan takes only a few seconds, though it may need to be repeated a few times. Corneal topography is one part of your full pre-operative examination, which also includes your prescription, eye pressure and a retina check.<\/p>\n<p><strong>After the test:<\/strong> topography itself has no after-effects. Your surgeon goes through the maps with you at the same appointment.<\/p><\/div>\n\t\t\t\t\t\t\t\t\t\t\t<\/div>\n<\/div><\/div><\/div><\/div><\/div><\/section>\n<!-- Image + Text (Text left, image right) End -->\n\n\n<!-- Flexible Section Start -->\n<section class=\"psec pad\" id=\"results\"><div class=\"container-fluid px-0\"><div class=\"row g-0\"><div class=\"col-12\"><h2 class=\"t48 sec-title\" data-reveal>How corneal topography results are read<\/h2><p class=\"t22 sec-lead\" data-reveal>Corneal topography interpretation is a specialist skill. Your surgeon looks at the patterns, the numbers and the two eyes side by side, together with your prescription and examination findings. These are the main elements.<\/p><div class=\"features row row-cols-1 row-cols-md-2 row-cols-lg-3 tint\" data-stagger><div class=\"col\"><div class=\"feat h-100\"><span class=\"feat-icon\" aria-hidden=\"true\"><svg width=\"26\" height=\"26\" aria-hidden=\"true\"><use href=\"#i-sun\"\/><\/svg><\/span><h3>Colour scales<\/h3><p>Warm colours (red and orange) show steeper or higher areas; cool colours (blue and purple) show flatter or lower areas; green represents values close to normal. EyeWiki notes that a lot of red is almost always abnormal, and that a tight or loose colour scale can hide or exaggerate a pattern, so maps must be read with their scale.<\/p><\/div><\/div><div class=\"col\"><div class=\"feat h-100\"><span class=\"feat-icon\" aria-hidden=\"true\"><svg width=\"26\" height=\"26\" aria-hidden=\"true\"><use href=\"#i-check\"\/><\/svg><\/span><h3>Normal patterns<\/h3><p>A normal cornea shows a round or oval pattern, or a symmetric &#8220;bow-tie&#8221; when regular astigmatism is present.<\/p><\/div><\/div><div class=\"col\"><div class=\"feat h-100\"><span class=\"feat-icon\" aria-hidden=\"true\"><svg width=\"26\" height=\"26\" aria-hidden=\"true\"><use href=\"#i-warn\"\/><\/svg><\/span><h3>Suspicious patterns<\/h3><p>An asymmetric bow-tie, a skewed axis between the two halves of the bow-tie, or steepening concentrated in the lower cornea can point towards keratoconus or another irregular cornea.<\/p><\/div><\/div><\/div><h3 class=\"t32 mt-v4 mb-v14\" data-reveal>Corneal topography normal values (screening guide)<\/h3><div class=\"tbl-wrap\" data-reveal><table class=\"tbl rsp\"><thead><tr><th scope=\"col\">Measurement<\/th><th scope=\"col\">Usually normal<\/th><th scope=\"col\">Raises suspicion<\/th><\/tr><\/thead><tbody><tr><th scope=\"row\">Central corneal power (central K)<\/th><td data-label=\"Usually normal\">below 47.2 D<\/td><td data-label=\"Raises suspicion\">47.2\u201348.7 D suggests possible keratoconus; above 48.7 D suggests clinical keratoconus<\/td><\/tr><tr><th scope=\"row\">Inferior\u2013superior (I-S) difference<\/th><td data-label=\"Usually normal\">below 1.4 D<\/td><td data-label=\"Raises suspicion\">1.4\u20131.8 D suspect; above 1.8 D suggests keratoconus<\/td><\/tr><tr><th scope=\"row\">Central corneal thickness<\/th><td data-label=\"Usually normal\">about 490\u2013650 microns<\/td><td data-label=\"Raises suspicion\">thin corneas, or a thinnest point displaced from the centre, need closer review<\/td><\/tr><tr><th scope=\"row\">Difference between your two eyes<\/th><td data-label=\"Usually normal\">small and symmetrical<\/td><td data-label=\"Raises suspicion\">marked asymmetry between eyes<\/td><\/tr><\/tbody><\/table><\/div><p class=\"t22 sec-intro is-small is-muted mt-v14\" data-reveal><em>These values come from published reviews and are screening guides only. Devices differ, and no single number confirms or rules out disease; your surgeon interprets the full picture.<\/em><\/p><p class=\"t22 sec-intro mt-v14\" data-reveal><strong>Tomography indices.<\/strong> Scheimpflug devices add analyses of the back surface and thickness profile. For example, the Belin\/Ambr\u00f3sio Enhanced Ectasia Display combines nine measurements, including front and back elevation, thinnest-point thickness and maximum curvature, into an overall score that helps separate normal corneas from those at risk.<\/p><\/div><\/div><\/div><\/section>\n<!-- Flexible Section End -->\n\n\n<!-- Image + Text (Photo band with overlay card) Start -->\n<section class=\"interior band\" id=\"price\"><div class=\"container-fluid px-0\"><div class=\"row g-0\"><div class=\"col-12\">\n\t\t<div class=\"interior-media\" aria-hidden=\"true\"><img loading=\"lazy\" decoding=\"async\" width=\"2000\" height=\"1131\" src=\"https:\/\/laseristanbulclinic.com\/wp-content\/uploads\/2026\/10\/eye-clinic-interior-istanbul.webp\" class=\"attachment-full size-full\" alt=\"Calm eye clinic interior in Istanbul\" sizes=\"auto, 100vw\" srcset=\"https:\/\/laseristanbulclinic.com\/wp-content\/uploads\/2026\/10\/eye-clinic-interior-istanbul.webp 2000w, https:\/\/laseristanbulclinic.com\/wp-content\/uploads\/2026\/10\/eye-clinic-interior-istanbul-300x170.webp 300w, https:\/\/laseristanbulclinic.com\/wp-content\/uploads\/2026\/10\/eye-clinic-interior-istanbul-1024x579.webp 1024w, https:\/\/laseristanbulclinic.com\/wp-content\/uploads\/2026\/10\/eye-clinic-interior-istanbul-768x434.webp 768w, https:\/\/laseristanbulclinic.com\/wp-content\/uploads\/2026\/10\/eye-clinic-interior-istanbul-1536x869.webp 1536w\" \/><\/div>\n\t\t<div class=\"interior-card\" data-reveal>\n\t\t\t\t<h2 class=\"t48\">Corneal topography is included in every treatment price<\/h2>\n\t\t\t\t\t\t<p class=\"t22\">It is part of your full pre-operative examination and scans with your surgeon. If you only want a corneal assessment, for example a keratoconus check or a second opinion, a standalone examination with topography costs <span class=\"ph\">{{\u00a3 price for a standalone corneal examination}}<\/span>. Hotel and transfers are not included and are a separate charge if you would like us to arrange them. You can also send recent scans from your own optician or eye doctor for a free initial review before you travel.<\/p>\n\t\t\t\t<a class=\"pill pill-white\" href=\"https:\/\/laseristanbulclinic.com\/en\/free-consultation\/\"><span class=\"pill-dot\" aria-hidden=\"true\"><\/span><span class=\"pill-label\">Send my scans for a free review<\/span><\/a>\t<\/div>\n<\/div><\/div><\/div><\/section>\n<!-- Image + Text (Photo band with overlay card) End -->\n\n\n<!-- Team (People list with photos) Start -->\n<section class=\"psec pad\" id=\"who\"><div class=\"container-fluid px-0\"><div class=\"row g-0\"><div class=\"col-12\">\n\t\t<h2 class=\"t48 sec-title\" data-reveal>Who reads your scans<\/h2>\n\t\t\t<p class=\"t22 sec-lead\" data-reveal>Your maps are read by the surgeon who will treat you, not just by a machine. If your scan shows anything unexpected, your surgeon explains what it means and what the options are, through your interpreter if you wish.<\/p>\n\t\t\t\t<div class=\"people rich row row-cols-1 row-cols-lg-3\" data-stagger><div class=\"col\"><a class=\"person h-100\" href=\"https:\/\/laseristanbulclinic.com\/en\/doctors\/doc-dr-muhammet-derda-ozer\/\"><img loading=\"lazy\" decoding=\"async\" width=\"294\" height=\"300\" src=\"https:\/\/laseristanbulclinic.com\/wp-content\/uploads\/2026\/10\/doc-dr-muhammet-derda-ozer-cornea-specialist-istanbul-294x300.webp\" class=\"attachment-medium size-medium\" alt=\"\" srcset=\"https:\/\/laseristanbulclinic.com\/wp-content\/uploads\/2026\/10\/doc-dr-muhammet-derda-ozer-cornea-specialist-istanbul-294x300.webp 294w, https:\/\/laseristanbulclinic.com\/wp-content\/uploads\/2026\/10\/doc-dr-muhammet-derda-ozer-cornea-specialist-istanbul-768x784.webp 768w, https:\/\/laseristanbulclinic.com\/wp-content\/uploads\/2026\/10\/doc-dr-muhammet-derda-ozer-cornea-specialist-istanbul.webp 790w\" sizes=\"auto, (max-width: 294px) 100vw, 294px\" \/><span><b>Do\u00e7. Dr. Muhammet Derda \u00d6zer<\/b><span>Our cornea and keratoconus specialist reviews corneal disease and keratoconus scans; he has published research on corneal cross-linking for keratoconus in young people.<\/span><\/span><\/a><\/div><div class=\"col\"><a class=\"person h-100\" href=\"https:\/\/laseristanbulclinic.com\/en\/doctors\/prof-dr-ahmet-satici\/\"><img loading=\"lazy\" decoding=\"async\" width=\"300\" height=\"300\" src=\"https:\/\/laseristanbulclinic.com\/wp-content\/uploads\/2026\/10\/prof-dr-ahmet-satici-ophthalmologist-istanbul-300x300.webp\" class=\"attachment-medium size-medium\" alt=\"\" srcset=\"https:\/\/laseristanbulclinic.com\/wp-content\/uploads\/2026\/10\/prof-dr-ahmet-satici-ophthalmologist-istanbul-300x300.webp 300w, https:\/\/laseristanbulclinic.com\/wp-content\/uploads\/2026\/10\/prof-dr-ahmet-satici-ophthalmologist-istanbul-150x150.webp 150w, https:\/\/laseristanbulclinic.com\/wp-content\/uploads\/2026\/10\/prof-dr-ahmet-satici-ophthalmologist-istanbul-768x768.webp 768w, https:\/\/laseristanbulclinic.com\/wp-content\/uploads\/2026\/10\/prof-dr-ahmet-satici-ophthalmologist-istanbul.webp 806w\" sizes=\"auto, (max-width: 300px) 100vw, 300px\" \/><span><b>Prof. Dr. Ahmet Sat\u0131c\u0131<\/b><span>Uses topography to plan laser eye surgery and lens surgery.<\/span><\/span><\/a><\/div><div class=\"col\"><a class=\"person h-100\" href=\"https:\/\/laseristanbulclinic.com\/en\/doctors\/op-dr-aysan-bayram\/\"><img loading=\"lazy\" decoding=\"async\" width=\"300\" height=\"300\" src=\"https:\/\/laseristanbulclinic.com\/wp-content\/uploads\/2026\/10\/op-dr-aysan-bayram-eye-surgeon-istanbul-300x300.webp\" class=\"attachment-medium size-medium\" alt=\"\" srcset=\"https:\/\/laseristanbulclinic.com\/wp-content\/uploads\/2026\/10\/op-dr-aysan-bayram-eye-surgeon-istanbul-300x300.webp 300w, https:\/\/laseristanbulclinic.com\/wp-content\/uploads\/2026\/10\/op-dr-aysan-bayram-eye-surgeon-istanbul-150x150.webp 150w, https:\/\/laseristanbulclinic.com\/wp-content\/uploads\/2026\/10\/op-dr-aysan-bayram-eye-surgeon-istanbul-768x768.webp 768w, https:\/\/laseristanbulclinic.com\/wp-content\/uploads\/2026\/10\/op-dr-aysan-bayram-eye-surgeon-istanbul.webp 806w\" sizes=\"auto, (max-width: 300px) 100vw, 300px\" \/><span><b>Op. Dr. Aysan Bayram<\/b><span>Uses topography to plan laser eye surgery and lens surgery.<\/span><\/span><\/a><\/div><\/div>\t\t<\/div><\/div><\/div><\/section>\n<!-- Team (People list with photos) End -->\n\n\n<!-- Table (Table on a tinted panel) Start -->\n<section class=\"panel\" id=\"treatments\"><div class=\"container-fluid px-0\"><div class=\"row g-0\"><div class=\"col-12\">\n\t\t<h2 class=\"t48 sec-title\" data-reveal>Treatments corneal topography supports<\/h2>\n\t\t\t\t<div class=\"tbl-wrap\" data-reveal><table class=\"tbl rsp\"><thead><tr><th scope=\"col\">Treatment<\/th><th scope=\"col\">How topography is used<\/th><\/tr><\/thead><tbody><tr><th scope=\"row\"><a href=\"\/en\/laser-eye-surgery-turkey\/\">Laser eye surgery<\/a> (LASIK, SMILE Pro, PRK)<\/th><td data-label=\"How topography is used\">Screens out weak corneas, chooses the safest method and plans the treatment<\/td><\/tr><tr><th scope=\"row\"><a href=\"\/en\/keratoconus-treatment-turkey\/\">Keratoconus treatment<\/a> (cross-linking, ring segments, transplant)<\/th><td data-label=\"How topography is used\">Diagnoses keratoconus, documents progression and plans treatment<\/td><\/tr><tr><th scope=\"row\"><a href=\"\/en\/lens-replacement-surgery-turkey\/\">Lens replacement<\/a> and <a href=\"\/en\/cataract-surgery-turkey\/\">cataract surgery<\/a><\/th><td data-label=\"How topography is used\">Helps choose toric or multifocal lenses and improves lens-power accuracy after previous laser surgery<\/td><\/tr><tr><th scope=\"row\"><a href=\"\/en\/icl-surgery-turkey\/\">ICL implantable lenses<\/a><\/th><td data-label=\"How topography is used\">Part of the assessment when the cornea is too thin or irregular for laser<\/td><\/tr><\/tbody><\/table><\/div>\t<\/div><\/div><\/div><\/section>\n<!-- Table (Table on a tinted panel) End -->\n\n\n<!-- Eye Tool (Tool cards) Start -->\r\n<section class=\"tools\" id=\"other\"><div class=\"container-fluid px-0\"><div class=\"row g-0\"><div class=\"col-12\">\r\n\t<div class=\"tools-inner pad\">\r\n\t\t\t\t<div class=\"sec-row\">\r\n\t\t\t\t\t\t<h2 class=\"t48\" data-reveal>Other tests in your eye examination<\/h2>\r\n\t\t\t\t\t\t\t\t\t<p class=\"t22\" data-reveal>Corneal topography is usually done alongside other scans, each answering a different question:<\/p>\r\n\t\t\t\t\t<\/div>\r\n\t\t\t\t\t\t<div class=\"tool-grid row row-cols-1 row-cols-md-2 row-cols-lg-4\" data-stagger>\r\n\t\t\t\t\t\t<div class=\"col\"><a class=\"tool h-100\" href=\"https:\/\/laseristanbulclinic.com\/en\/eye-tests-diagnostics\/oct-scan\/\"><span class=\"tool-tag t22\">Scan<\/span><h3 class=\"t32\">OCT scan<\/h3><p class=\"t22\">Detailed cross-section scans of the eye (optical coherence tomography).<\/p><span class=\"tool-go\">Read more <svg width=\"18\" height=\"18\" aria-hidden=\"true\"><use href=\"#i-arrow\"\/><\/svg><\/span><\/a><\/div>\r\n\t\t\t\t\t\t<div class=\"col\"><a class=\"tool h-100\" href=\"https:\/\/laseristanbulclinic.com\/en\/eye-tests-diagnostics\/fluorescein-angiography\/\"><span class=\"tool-tag t22\">Imaging<\/span><h3 class=\"t32\">FFA<\/h3><p class=\"t22\">Fundus fluorescein angiography: imaging of the blood vessels at the back of the eye.<\/p><span class=\"tool-go\">Read more <svg width=\"18\" height=\"18\" aria-hidden=\"true\"><use href=\"#i-arrow\"\/><\/svg><\/span><\/a><\/div>\r\n\t\t\t\t\t\t<div class=\"col\"><a class=\"tool h-100\" href=\"https:\/\/laseristanbulclinic.com\/en\/eye-tests-diagnostics\/eye-ultrasound\/\"><span class=\"tool-tag t22\">Imaging<\/span><h3 class=\"t32\">Eye ultrasound (B-scan)<\/h3><p class=\"t22\">Imaging when the inside of the eye cannot be seen directly.<\/p><span class=\"tool-go\">Read more <svg width=\"18\" height=\"18\" aria-hidden=\"true\"><use href=\"#i-arrow\"\/><\/svg><\/span><\/a><\/div>\r\n\t\t\t\t\t\t<div class=\"col\"><a class=\"tool h-100\" href=\"https:\/\/laseristanbulclinic.com\/en\/eye-tests-diagnostics\/visual-field-test\/\"><span class=\"tool-tag t22\">Test<\/span><h3 class=\"t32\">Visual field test<\/h3><p class=\"t22\">Perimetry checks your side vision.<\/p><span class=\"tool-go\">Read more <svg width=\"18\" height=\"18\" aria-hidden=\"true\"><use href=\"#i-arrow\"\/><\/svg><\/span><\/a><\/div>\r\n\t\t\t\t\t\t<div class=\"col\"><a class=\"tool h-100\" href=\"https:\/\/laseristanbulclinic.com\/en\/eye-tests-diagnostics\/tonometry\/\"><span class=\"tool-tag t22\">Test<\/span><h3 class=\"t32\">Tonometry<\/h3><p class=\"t22\">Eye pressure measurement, important for glaucoma checks; readings can be lower after laser eye surgery.<\/p><span class=\"tool-go\">Read more <svg width=\"18\" height=\"18\" aria-hidden=\"true\"><use href=\"#i-arrow\"\/><\/svg><\/span><\/a><\/div>\r\n\t\t\t\t\t\t<div class=\"col\"><a class=\"tool h-100\" href=\"https:\/\/laseristanbulclinic.com\/en\/eye-tests-diagnostics\/vep-erg-tests\/\"><span class=\"tool-tag t22\">Test<\/span><h3 class=\"t32\">VEP &amp; ERG<\/h3><p class=\"t22\">Electrophysiology tests measure the electrical responses of the retina and visual pathway.<\/p><span class=\"tool-go\">Read more <svg width=\"18\" height=\"18\" aria-hidden=\"true\"><use href=\"#i-arrow\"\/><\/svg><\/span><\/a><\/div>\r\n\t\t\t\t\t\t<div class=\"col\"><a class=\"tool h-100\" href=\"https:\/\/laseristanbulclinic.com\/en\/eye-tests-diagnostics\/\"><span class=\"tool-tag t22\">Hub<\/span><h3 class=\"t32\">All eye examinations<\/h3><p class=\"t22\">Every examination and diagnostic test we offer.<\/p><span class=\"tool-go\">See all tests <svg width=\"18\" height=\"18\" aria-hidden=\"true\"><use href=\"#i-arrow\"\/><\/svg><\/span><\/a><\/div>\r\n\t\t\t\t\t\t<div class=\"col\"><a class=\"tool h-100\" href=\"https:\/\/laseristanbulclinic.com\/en\/eye-glossary\/cornea\/\"><span class=\"tool-tag t22\">Glossary<\/span><h3 class=\"t32\">Cornea<\/h3><p class=\"t22\">What the cornea is, its layers, function and diseases.<\/p><span class=\"tool-go\">Read more <svg width=\"18\" height=\"18\" aria-hidden=\"true\"><use href=\"#i-arrow\"\/><\/svg><\/span><\/a><\/div>\r\n\t\t\t\t\t<\/div>\r\n\t\t\t\t\t\t\t\t\t<\/div>\r\n<\/div><\/div><\/div><\/section>\r\n<!-- Eye Tool (Tool cards) End -->\r\n\n\n<!-- FAQ (FAQ accordion) Start -->\n<section class=\"faq pad\" id=\"faq\"><div class=\"container-fluid px-0\"><div class=\"row g-0\"><div class=\"col-12\"><div class=\"faq-grid\">\n\t<div class=\"faq-side\">\n\t\t\t\t<h2 class=\"t48\" data-reveal>Corneal topography: frequently asked questions<\/h2>\n\t\t\t\t\t\t\t<\/div>\n\t\t<div class=\"acc\" data-stagger>\n\t\t\t\t<div class=\"acc-item is-open\"><h3><button type=\"button\" class=\"t32\" aria-expanded=\"true\" aria-controls=\"faq-641ff085-a1\" id=\"faq-641ff085-q1\">What is a corneal topography test?<svg width=\"24\" height=\"24\" aria-hidden=\"true\"><use href=\"#i-plus\"\/><\/svg><\/button><\/h3><div class=\"acc-panel\" id=\"faq-641ff085-a1\" role=\"region\" aria-labelledby=\"faq-641ff085-q1\"><div class=\"acc-body\"><p class=\"t22\">A corneal topography test is a painless, no-touch scan that maps the shape and curvature of your cornea. It turns thousands of measurements into colour maps, showing your surgeon steep and flat areas, astigmatism and, on tomography devices, corneal thickness and the back surface.<\/p><\/div><\/div><\/div>\n\t\t\t\t<div class=\"acc-item\"><h3><button type=\"button\" class=\"t32\" aria-expanded=\"false\" aria-controls=\"faq-641ff085-a2\" id=\"faq-641ff085-q2\">Why is a corneal topography test done?<svg width=\"24\" height=\"24\" aria-hidden=\"true\"><use href=\"#i-plus\"\/><\/svg><\/button><\/h3><div class=\"acc-panel\" id=\"faq-641ff085-a2\" role=\"region\" aria-labelledby=\"faq-641ff085-q2\"><div class=\"acc-body\"><p class=\"t22\">It is done to detect astigmatism, keratoconus, scarring and other irregular corneas, to check whether laser eye surgery is safe, and to plan laser, lens and cataract surgery. It is also used to fit specialist contact lenses and to monitor keratoconus over time.<\/p><\/div><\/div><\/div>\n\t\t\t\t<div class=\"acc-item\"><h3><button type=\"button\" class=\"t32\" aria-expanded=\"false\" aria-controls=\"faq-641ff085-a3\" id=\"faq-641ff085-q3\">Is corneal topography painful?<svg width=\"24\" height=\"24\" aria-hidden=\"true\"><use href=\"#i-plus\"\/><\/svg><\/button><\/h3><div class=\"acc-panel\" id=\"faq-641ff085-a3\" role=\"region\" aria-labelledby=\"faq-641ff085-q3\"><div class=\"acc-body\"><p class=\"t22\">No. Nothing touches your eye. You rest your chin on a support and look at a light for a few seconds while the images are taken.<\/p><\/div><\/div><\/div>\n\t\t\t\t<div class=\"acc-item\"><h3><button type=\"button\" class=\"t32\" aria-expanded=\"false\" aria-controls=\"faq-641ff085-a4\" id=\"faq-641ff085-q4\">How long does corneal topography take?<svg width=\"24\" height=\"24\" aria-hidden=\"true\"><use href=\"#i-plus\"\/><\/svg><\/button><\/h3><div class=\"acc-panel\" id=\"faq-641ff085-a4\" role=\"region\" aria-labelledby=\"faq-641ff085-q4\"><div class=\"acc-body\"><p class=\"t22\">Each scan takes a few seconds, and it is usually repeated a few times per eye to check consistency. It is one short part of a full eye examination.<\/p><\/div><\/div><\/div>\n\t\t\t\t<div class=\"acc-item\"><h3><button type=\"button\" class=\"t32\" aria-expanded=\"false\" aria-controls=\"faq-641ff085-a5\" id=\"faq-641ff085-q5\">Do I need to stop wearing contact lenses before the test?<svg width=\"24\" height=\"24\" aria-hidden=\"true\"><use href=\"#i-plus\"\/><\/svg><\/button><\/h3><div class=\"acc-panel\" id=\"faq-641ff085-a5\" role=\"region\" aria-labelledby=\"faq-641ff085-q5\"><div class=\"acc-body\"><p class=\"t22\">Yes, usually. Contact lenses can temporarily change the shape of the cornea and give misleading maps. Typical advice is at least 1 week for soft lenses and 2 weeks or more for rigid lenses; before a laser surgery assessment the FDA advises 2\u20134 weeks depending on the lens type. We confirm the exact timing for you.<\/p><\/div><\/div><\/div>\n\t\t\t\t<div class=\"acc-item\"><h3><button type=\"button\" class=\"t32\" aria-expanded=\"false\" aria-controls=\"faq-641ff085-a6\" id=\"faq-641ff085-q6\">What is a normal corneal topography result?<svg width=\"24\" height=\"24\" aria-hidden=\"true\"><use href=\"#i-plus\"\/><\/svg><\/button><\/h3><div class=\"acc-panel\" id=\"faq-641ff085-a6\" role=\"region\" aria-labelledby=\"faq-641ff085-q6\"><div class=\"acc-body\"><p class=\"t22\">A normal result shows a smooth, symmetrical pattern: round, oval or a symmetric bow-tie, with central corneal power below about 47 dioptres and similar maps in both eyes. Your surgeon reads the numbers together with the patterns, because no single value confirms or rules out disease.<\/p><\/div><\/div><\/div>\n\t\t\t\t<div class=\"acc-item\"><h3><button type=\"button\" class=\"t32\" aria-expanded=\"false\" aria-controls=\"faq-641ff085-a7\" id=\"faq-641ff085-q7\">Is Pentacam the same as corneal topography?<svg width=\"24\" height=\"24\" aria-hidden=\"true\"><use href=\"#i-plus\"\/><\/svg><\/button><\/h3><div class=\"acc-panel\" id=\"faq-641ff085-a7\" role=\"region\" aria-labelledby=\"faq-641ff085-q7\"><div class=\"acc-body\"><p class=\"t22\">Not exactly. Pentacam is a widely used rotating Scheimpflug camera that performs corneal tomography: it maps the front and back surfaces and the thickness of the cornea, not just the front. Many people use &#8220;topography&#8221; for both.<\/p><\/div><\/div><\/div>\n\t\t\t\t<div class=\"acc-item\"><h3><button type=\"button\" class=\"t32\" aria-expanded=\"false\" aria-controls=\"faq-641ff085-a8\" id=\"faq-641ff085-q8\">Can corneal topography detect keratoconus?<svg width=\"24\" height=\"24\" aria-hidden=\"true\"><use href=\"#i-plus\"\/><\/svg><\/button><\/h3><div class=\"acc-panel\" id=\"faq-641ff085-a8\" role=\"region\" aria-labelledby=\"faq-641ff085-q8\"><div class=\"acc-body\"><p class=\"t22\">Yes. Topography and tomography are the main tests used to diagnose keratoconus, including early cases that a glasses test or a standard eye examination can miss. Repeated scans also show whether it is getting worse, which helps decide on cross-linking.<\/p><\/div><\/div><\/div>\n\t\t\t\t<div class=\"acc-item\"><h3><button type=\"button\" class=\"t32\" aria-expanded=\"false\" aria-controls=\"faq-641ff085-a9\" id=\"faq-641ff085-q9\">How much does a corneal topography test cost?<svg width=\"24\" height=\"24\" aria-hidden=\"true\"><use href=\"#i-plus\"\/><\/svg><\/button><\/h3><div class=\"acc-panel\" id=\"faq-641ff085-a9\" role=\"region\" aria-labelledby=\"faq-641ff085-q9\"><div class=\"acc-body\"><p class=\"t22\">Corneal topography is included in every treatment price at Laser Istanbul Clinic as part of your pre-operative examination. A standalone corneal examination with topography costs <span class=\"ph\">{{\u00a3 price for a standalone corneal examination}}<\/span>.<\/p><\/div><\/div><\/div>\n\t\t\t\t<div class=\"acc-item\"><h3><button type=\"button\" class=\"t32\" aria-expanded=\"false\" aria-controls=\"faq-641ff085-a10\" id=\"faq-641ff085-q10\">Can I send scans I already have?<svg width=\"24\" height=\"24\" aria-hidden=\"true\"><use href=\"#i-plus\"\/><\/svg><\/button><\/h3><div class=\"acc-panel\" id=\"faq-641ff085-a10\" role=\"region\" aria-labelledby=\"faq-641ff085-q10\"><div class=\"acc-body\"><p class=\"t22\">Yes. Upload recent topography or tomography scans with your prescription, and a surgeon will review them free of charge. Earlier scans are especially useful for keratoconus, because comparing them shows whether the cornea is changing.<\/p><\/div><\/div><\/div>\n\t\t\t<\/div>\n\t<\/div><\/div><\/div><\/div><script type=\"application\/ld+json\">{\"@context\":\"https:\/\/schema.org\",\"@type\":\"FAQPage\",\"mainEntity\":[{\"@type\":\"Question\",\"name\":\"What is a corneal topography test?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"A corneal topography test is a painless, no-touch scan that maps the shape and curvature of your cornea. It turns thousands of measurements into colour maps, showing your surgeon steep and flat areas, astigmatism and, on tomography devices, corneal thickness and the back surface.\"}},{\"@type\":\"Question\",\"name\":\"Why is a corneal topography test done?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"It is done to detect astigmatism, keratoconus, scarring and other irregular corneas, to check whether laser eye surgery is safe, and to plan laser, lens and cataract surgery. It is also used to fit specialist contact lenses and to monitor keratoconus over time.\"}},{\"@type\":\"Question\",\"name\":\"Is corneal topography painful?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"No. Nothing touches your eye. You rest your chin on a support and look at a light for a few seconds while the images are taken.\"}},{\"@type\":\"Question\",\"name\":\"How long does corneal topography take?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Each scan takes a few seconds, and it is usually repeated a few times per eye to check consistency. It is one short part of a full eye examination.\"}},{\"@type\":\"Question\",\"name\":\"Do I need to stop wearing contact lenses before the test?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Yes, usually. Contact lenses can temporarily change the shape of the cornea and give misleading maps. Typical advice is at least 1 week for soft lenses and 2 weeks or more for rigid lenses; before a laser surgery assessment the FDA advises 2\u20134 weeks depending on the lens type. We confirm the exact timing for you.\"}},{\"@type\":\"Question\",\"name\":\"What is a normal corneal topography result?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"A normal result shows a smooth, symmetrical pattern: round, oval or a symmetric bow-tie, with central corneal power below about 47 dioptres and similar maps in both eyes. Your surgeon reads the numbers together with the patterns, because no single value confirms or rules out disease.\"}},{\"@type\":\"Question\",\"name\":\"Is Pentacam the same as corneal topography?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Not exactly. Pentacam is a widely used rotating Scheimpflug camera that performs corneal tomography: it maps the front and back surfaces and the thickness of the cornea, not just the front. Many people use \\\"topography\\\" for both.\"}},{\"@type\":\"Question\",\"name\":\"Can corneal topography detect keratoconus?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Yes. Topography and tomography are the main tests used to diagnose keratoconus, including early cases that a glasses test or a standard eye examination can miss. Repeated scans also show whether it is getting worse, which helps decide on cross-linking.\"}},{\"@type\":\"Question\",\"name\":\"How much does a corneal topography test cost?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Corneal topography is included in every treatment price at Laser Istanbul Clinic as part of your pre-operative examination. A standalone corneal examination with topography costs {{\u00a3 price for a standalone corneal examination}}.\"}},{\"@type\":\"Question\",\"name\":\"Can I send scans I already have?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Yes. Upload recent topography or tomography scans with your prescription, and a surgeon will review them free of charge. Earlier scans are especially useful for keratoconus, because comparing them shows whether the cornea is changing.\"}}]}<\/script><\/section>\n<!-- FAQ (FAQ accordion) End -->\n\n\n<!-- Call to Action (Assessment band) Start -->\n<section class=\"cta-band\" id=\"assessment\">\n\t<div class=\"contact-bg\" aria-hidden=\"true\"><span><\/span><span><\/span><span><\/span><\/div>\n\t<div class=\"cta-inner pad container-fluid\"><div class=\"row\">\n\t\t<div class=\"col-12 col-lg-7\"><div class=\"cta-copy\">\n\t\t\t\t\t\t<h2 class=\"t64\" data-reveal>Have scans already? Let a surgeon look at them, free<\/h2>\n\t\t\t\t\t\t<p class=\"t22\" data-reveal>Upload your prescription and any corneal topography or eye reports. Do\u00e7. Dr. \u00d6zer, Prof. Dr. Sat\u0131c\u0131 or Op. Dr. Bayram will tell you what they show and which treatments may suit you, with no obligation.<\/p>\t\t\t\t\t\t<div class=\"cta-actions\" data-reveal><a class=\"pill pill-white\" href=\"https:\/\/laseristanbulclinic.com\/en\/free-consultation\/\"><span class=\"pill-dot\" aria-hidden=\"true\"><\/span><span class=\"pill-label\">Upload my scans for a free consultation<\/span><\/a><a class=\"pill pill-line\" href=\"https:\/\/wa.me\/90123456789\" target=\"_blank\" rel=\"noopener\"><span class=\"pill-dot\" aria-hidden=\"true\"><\/span><span class=\"pill-label\">WhatsApp: +90 123 456 789<\/span><\/a><a class=\"pill pill-line\" href=\"tel:+902121234567\"><span class=\"pill-dot\" aria-hidden=\"true\"><\/span><span class=\"pill-label\">Call: +90 212 123 45 67<\/span><\/a><\/div>\n\t\t\t\t\t<\/div><\/div>\n\t\t\t\t<div class=\"col-12 col-lg-5\"><div class=\"proof-card\" data-reveal>\n\t\t\t\t\t\t<div class=\"proof-text\">\n\t\t\t\t\t\t\t\t<h3 class=\"t48\">3 eye surgeons<\/h3>\n\t\t\t\t\t\t\t\t\t\t\t\t<p class=\"t22\">Your case is reviewed by a named surgeon, not a salesperson. Reply within <span class=\"ph\">{{response time}}<\/span>.<\/p>\n\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t\t\t\t\t<ul class=\"avatars\" aria-label=\"Our surgeons\">\n\t\t\t\t\t\t\t\t<li><img decoding=\"async\" width=\"150\" height=\"150\" src=\"https:\/\/laseristanbulclinic.com\/wp-content\/uploads\/2026\/10\/prof-dr-ahmet-satici-ophthalmologist-istanbul-150x150.webp\" class=\"attachment-thumbnail size-thumbnail\" alt=\"Prof. Dr. Ahmet Sat\u0131c\u0131\" loading=\"lazy\" srcset=\"https:\/\/laseristanbulclinic.com\/wp-content\/uploads\/2026\/10\/prof-dr-ahmet-satici-ophthalmologist-istanbul-150x150.webp 150w, https:\/\/laseristanbulclinic.com\/wp-content\/uploads\/2026\/10\/prof-dr-ahmet-satici-ophthalmologist-istanbul-300x300.webp 300w, https:\/\/laseristanbulclinic.com\/wp-content\/uploads\/2026\/10\/prof-dr-ahmet-satici-ophthalmologist-istanbul-768x768.webp 768w, https:\/\/laseristanbulclinic.com\/wp-content\/uploads\/2026\/10\/prof-dr-ahmet-satici-ophthalmologist-istanbul.webp 806w\" sizes=\"auto, (max-width: 150px) 100vw, 150px\" \/><span class=\"tip\">Prof. Dr. Ahmet Sat\u0131c\u0131<\/span><\/li>\n\t\t\t\t\t\t\t\t<li><img decoding=\"async\" width=\"150\" height=\"150\" src=\"https:\/\/laseristanbulclinic.com\/wp-content\/uploads\/2026\/10\/doc-dr-muhammet-derda-ozer-cornea-specialist-istanbul-150x150.webp\" class=\"attachment-thumbnail size-thumbnail\" alt=\"Do\u00e7. Dr. Muhammet Derda \u00d6zer\" loading=\"lazy\" \/><span class=\"tip\">Do\u00e7. Dr. Muhammet Derda \u00d6zer<\/span><\/li>\n\t\t\t\t\t\t\t\t<li><img decoding=\"async\" width=\"150\" height=\"150\" src=\"https:\/\/laseristanbulclinic.com\/wp-content\/uploads\/2026\/10\/op-dr-aysan-bayram-eye-surgeon-istanbul-150x150.webp\" class=\"attachment-thumbnail size-thumbnail\" alt=\"Op. Dr. Aysan Bayram\" loading=\"lazy\" srcset=\"https:\/\/laseristanbulclinic.com\/wp-content\/uploads\/2026\/10\/op-dr-aysan-bayram-eye-surgeon-istanbul-150x150.webp 150w, https:\/\/laseristanbulclinic.com\/wp-content\/uploads\/2026\/10\/op-dr-aysan-bayram-eye-surgeon-istanbul-300x300.webp 300w, https:\/\/laseristanbulclinic.com\/wp-content\/uploads\/2026\/10\/op-dr-aysan-bayram-eye-surgeon-istanbul-768x768.webp 768w, https:\/\/laseristanbulclinic.com\/wp-content\/uploads\/2026\/10\/op-dr-aysan-bayram-eye-surgeon-istanbul.webp 806w\" sizes=\"auto, (max-width: 150px) 100vw, 150px\" \/><span class=\"tip\">Op. Dr. Aysan Bayram<\/span><\/li>\n\t\t\t\t\t\t\t<\/ul>\n\t\t\t\t\t<\/div><\/div>\n\t\t\t<\/div><\/div>\n<\/section>\n<!-- Call to Action (Assessment band) End -->\n","protected":false},"excerpt":{"rendered":"","protected":false},"author":0,"featured_media":0,"parent":1760,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"_acf_changed":false,"footnotes":""},"class_list":["post-1876","page","type-page","status-publish","hentry"],"acf":[],"_links":{"self":[{"href":"https:\/\/laseristanbulclinic.com\/en\/wp-json\/wp\/v2\/pages\/1876","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/laseristanbulclinic.com\/en\/wp-json\/wp\/v2\/pages"}],"about":[{"href":"https:\/\/laseristanbulclinic.com\/en\/wp-json\/wp\/v2\/types\/page"}],"replies":[{"embeddable":true,"href":"https:\/\/laseristanbulclinic.com\/en\/wp-json\/wp\/v2\/comments?post=1876"}],"version-history":[{"count":2,"href":"https:\/\/laseristanbulclinic.com\/en\/wp-json\/wp\/v2\/pages\/1876\/revisions"}],"predecessor-version":[{"id":3021,"href":"https:\/\/laseristanbulclinic.com\/en\/wp-json\/wp\/v2\/pages\/1876\/revisions\/3021"}],"up":[{"embeddable":true,"href":"https:\/\/laseristanbulclinic.com\/en\/wp-json\/wp\/v2\/pages\/1760"}],"wp:attachment":[{"href":"https:\/\/laseristanbulclinic.com\/en\/wp-json\/wp\/v2\/media?parent=1876"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}