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Anemic Eyes vs Normal Eyes: How Iron Deficiency Shows Up in the Eyes
When you compare anemic eyes with normal eyes, the clue is the inner lining of the lower eyelid, which is usually pink to red and looks paler in anemia. This check is a hint, not a test: a 2023 systematic review found it picks up anemia anywhere between 19% and 97% of the time. Only a blood test (haemoglobin and ferritin) confirms iron deficiency. Severe anemia can also harm the retina and optic nerve, so a sudden change in vision needs an eye examination.
What do anemic eyes look like compared with normal eyes?
Anemic eyes look paler on the inside, not on the outside. The part doctors look at is the lower palpebral conjunctiva, the moist pink lining you see when you gently pull your lower eyelid down. Because that lining is thin and full of small blood vessels, its colour reflects how much haemoglobin is in your blood. When haemoglobin is low (anemia, spelled anaemia in the UK), the lining tends to look paler.
| Normal eyes | Anemic eyes | |
|---|---|---|
| Inside of the lower eyelid (palpebral conjunctiva) | Pink to red, with visible fine vessels | Paler pink, pink-white or washed out |
| White of the eye (sclera) | White | Usually still white; a blue tint can appear in iron deficiency (see below) |
| Skin around the eyes | Normal for your skin tone | May look pale, but this is not specific to the eyes |
| What it tells you | Nothing reliable on its own | A reason to ask for a blood test, never a diagnosis |
A pale eyelid lining is called conjunctival pallor. It is one of several places doctors check for pallor, alongside the nail beds and the palms. The skin on your face is a poor guide, because skin tone, tan, make-up, lighting and tiredness all change how it looks.
How do you check for anemia in your eyes?
You can look, but do not rely on what you see. If you want to know how to check anemia in eyes, this is the method used in clinics:
- Wash your hands and sit in good natural daylight, facing a window, not under a yellow bulb.
- Look straight ahead and gently pull your lower eyelid down with a clean finger. Do not press on the eyeball.
- Look at the exposed lining of the lower lid (the lower palpebral conjunctiva). Note whether it looks rosy or pale.
- Compare both eyes. Do not stare at it for long: the colour changes with rubbing, allergy, dry eye and irritation.
- Whatever you see, do not decide for yourself. If you have symptoms of anemia (see below), ask your GP for a blood test.
Stop and see a doctor if the lining looks red and swollen, the eye is painful, you have discharge, or your vision is changing. That is more likely an eye problem such as conjunctivitis, and needs a different approach.
If the real worry is a bump you can see or feel on your eyelid, that is a separate problem: see our guide to a lump on the eyelid: sebaceous cyst, stye or chalazion?
How accurate is the eyelid check for anemia?
Not accurate enough to rely on, according to the research. A 2023 systematic review in the Indian Journal of Hematology and Blood Transfusion looked at 14 studies of people aged 5 and older (8 of them in pregnant women). It found that checking for conjunctival pallor detected anemia between 19% and 97% of the time (sensitivity) and correctly cleared people without anemia between 65% and 100% of the time (specificity). Nail bed pallor (41–65% sensitivity) and palm pallor (33–91%) were no better. Checking nine or more body sites together was more accurate, with sensitivity of 73.8% to 82.9%, but takes more time.
A 2005 meta-analysis in BMC Pediatrics (11 studies in children, mostly in Africa) reached a similar conclusion: pallor of the eyelid lining, palms or nail beds is only a modest guide, and the authors wrote that it did not document a highly accurate clinical sign of anemia.
Why is it so variable? Colour judgement differs between observers, mild anemia hardly changes colour, and lighting and skin tone change what we see. The practical message:
- A pale lining raises suspicion; a pink one does not rule anemia out.
- Mild and early iron deficiency may leave the eyelid lining looking normal.
- A blood test is the only way to know.
Can photos or an app show anemia in the eyes?
Photos of anemia eyes online cannot tell you whether you are anemic. Colour in a photo depends on the lighting, the camera's white balance and the screen you view it on, so a picture of your eyelid is not comparable with an image you find on the internet. That is why searching for "anemic eyes pictures vs normal" rarely gives a useful answer.
Researchers are working on this properly. In 2023, a team published a public set of eye images, often called the Eyes-Defy-Anemia dataset, taken from Indian and Italian patients under strict, standardised conditions. A machine-learning model trained on the palpebral conjunctiva images could separate anemic from non-anemic patients, and the authors reported that the findings held up across different ethnicities. A 2025 study then trained a deep-learning model on the same dataset, using images of the eyelid lining, palm and fingernail. It reached 84.9% accuracy on the original data, but 71.6% accuracy when tested on 101 new patients in a hospital. These results are encouraging for the future, but they are research tools, not something a phone camera can do for you today.
Can you have iron deficiency with non anemic eyes?
Yes. Iron deficiency and anemia are not the same thing. Your body can run low on stored iron while your haemoglobin is still in the normal range. In that stage you may feel tired and unwell, but your eyelid lining can look perfectly normal, because the colour depends on haemoglobin, not on stored iron. So "non anemic eyes" do not exclude iron deficiency, and a normal eyelid check should never talk you out of a blood test.
This is where ferritin comes in. Ferritin is the protein that stores iron, and a blood ferritin level is a standard test for iron stores. A Cochrane review of 72 studies (6,059 participants) found that at a cut-off of 30 micrograms per litre, ferritin was reasonably sensitive (79%) and very specific (98%) for iron deficiency in people attending for medical care. The authors rated the evidence as low certainty, and cut-offs differ between laboratories and with inflammation, so your own result needs a doctor's interpretation.
Two points about low ferritin and the eyes. First, low ferritin does not itself change how your eyes look. It matters because it shows that your iron is running low before anemia and its eye effects develop. Second, the NHS diagnoses iron deficiency anaemia with a full blood count and, when the cause is unclear, adds tests such as a faecal immunochemical test (FIT) for blood in the stool, or a referral to a specialist.
Does iron deficiency make the whites of the eyes blue?
Sometimes. A blue or grey-blue tint to the sclera (the white of the eye) has been described as an overlooked sign of iron deficiency. In a 2019 pilot study in the Journal of Clinical Medicine, researchers photographed the eyes of 74 people with suspected iron deficiency; 67 could be analysed and 51 of them had confirmed iron deficiency. Blue sclera was more common in the iron-deficient group. A doctor's assessment of the colour had a sensitivity of 60.8%, a specificity of 68.8% and a positive predictive value of 86.1%, and the result did not depend on whether the person was anemic, or on eye colour or sex. A computer analysis of the images gave a sensitivity of 78.4% and a specificity of 50%.
In plain language: a blue tint makes iron deficiency more likely, but many people with iron deficiency do not have it, and some people without iron deficiency do. Other conditions can also cause blue sclera, so the sign needs a blood test and a doctor's opinion, not a self-diagnosis.
Can anemia damage the retina or the optic nerve?
Yes, in more severe or longer-lasting anemia, although this is not expected in mild iron deficiency. The retina, the light-sensing layer at the back of the eye, uses a lot of oxygen, and the optic nerve carries its signals to the brain. Both can be affected.
Anemic retinopathy (bleeding and swelling in the retina). In a study published in 2023 in the Beyoglu Eye Journal, doctors examined 128 eyes of 70 people with anemia. Retinopathy (retinal haemorrhages, Roth's spots, exudates, cotton wool spots or retinal swelling) was found in 38 eyes, or 30%. The group with retinopathy had a lower mean haemoglobin (7.82 g/dl), and a haemoglobin below 8.95 g/dl predicted retinopathy with 85.8% sensitivity and 68.9% specificity. The authors recommend a retinal examination for people with severe anemia. In one 2022 case report in BMJ Case Reports, a 70-year-old man had swelling of one optic disc and retinal bleeding; iron-deficiency anemia caused by a bowel cancer was found, and the eye findings resolved completely after treatment of the anemia and the tumour.
A thinner choroid. In a 2015 study in BMC Ophthalmology, 96 women with iron-deficiency anemia had a thinner choroid (the blood-vessel layer behind the retina) than 60 healthy women, measured by optical coherence tomography (OCT). Macular thickness did not differ, and the authors suggested the choroid measurement as a possible early marker.
Swelling of the optic nerve and raised pressure in the skull. Anemia has been linked to idiopathic intracranial hypertension (IIH), a condition in which pressure around the brain rises and the optic nerve head swells (papilledema). A 2022 systematic review and meta-analysis found anemia in 18.2% of 774 people with IIH, with a relative risk of 1.44 compared with controls. Iron deficiency caused 51.6% of the anemia cases, and 59.7% of the patients improved with anemia treatment alone. An earlier 2003 report in the American Journal of Ophthalmology described six patients with papilledema and severe iron-deficiency anemia whose symptoms resolved dramatically after the anemia was treated. Both papers recommend a full blood count for people with papilledema, particularly when the picture is unusual or treatment is not working.
Rare blockages. A 2022 case report described a branch retinal artery occlusion as the first sign of severe iron-deficiency anemia. This is rare, but it shows why sudden vision loss should never be put down to "just anemia" without an eye examination.
| Possible eye effect | Typical setting | What the evidence says |
|---|---|---|
| Pale eyelid lining (conjunctival pallor) | Anemia | Useful hint; sensitivity 19–97% in a 2023 review |
| Blue sclera | Iron deficiency, with or without anemia | Supports suspicion; sensitivity about 61% (doctor's grading) in a 2019 pilot |
| Retinal bleeding, Roth's spots, cotton wool spots | Severe anemia | Seen in 30% of eyes in one 2023 study; reversed with treatment of the cause in reported cases |
| Thinner choroid | Iron-deficiency anemia | Found on OCT in a 2015 study of 96 women |
| Optic nerve swelling (papilledema) | Anemia with raised skull pressure (IIH) | Anemia found in 18.2% of people with IIH in a 2022 meta-analysis |
| Retinal artery occlusion | Very rare, severe anemia | Case report only |
What are five less obvious signs of iron deficiency, with or without anemia?
The NHS lists tiredness, lack of energy, shortness of breath and paler than usual skin as the usual signs of iron deficiency anaemia. These "5 weird signs of iron deficiency" are the less expected ones, and each comes from the sources on this page:
Ringing in the ears (tinnitus)
The NHS lists it among the less common symptoms.
A change in how food tastes
Also listed by the NHS.
Itching
The NHS lists itching as a symptom.
A blue tint to the whites of the eyes
Described above, and present with or without anemia in the 2019 pilot study.
Headaches with blurred or fading vision
Rarely, anemia is associated with raised pressure around the brain and a swollen optic nerve (see above). This is uncommon, but it is the one on the list that needs prompt attention.
Because these signs are not specific, they do not prove iron deficiency. They are reasons to have your blood tested.
Who is more likely to be iron deficient?
According to the NHS, iron deficiency anaemia is the most common type of anaemia, and it is usually caused by blood loss or pregnancy. The main causes it lists are:
- heavy periods
- pregnancy
- bleeding in the digestive system, for example from stomach ulcers, bowel inflammation, piles, or bowel and stomach cancers, or from medicines such as ibuprofen and aspirin
- not getting enough iron in the diet
The World Health Organization (WHO) estimates that in 2019, 30% of women aged 15–49 years, 37% of pregnant women and 40% of children aged 6–59 months were affected by anaemia worldwide, and lists inadequate dietary iron as the most common nutritional cause. Other causes the WHO lists include deficiencies of vitamins A, folate and B12, infections such as malaria, inherited conditions such as thalassaemia and chronic disease.
Not every pale or tired patient is short of iron. Vitamin B12 deficiency can also cause anemia and eye problems, including retinal bleeding in published case reports. Read our guide to vitamin B12 deficiency and its eye symptoms to compare the two.
How is iron deficiency treated, and what happens to the eyes?
Treatment is usually simple and is managed by your GP or a blood specialist, not by an eye surgeon. According to the NHS:
- Iron tablets replace the missing iron, and you usually need to take them for about 6 months.
- Taking the tablets with or soon after food can reduce side effects such as constipation, diarrhoea, stomach pain, heartburn, nausea and dark stools. Drinking orange juice after a tablet may help absorption.
- Your GP may repeat blood tests over the following months to check that your iron is back to normal.
- If the cause is unclear, further tests such as a faecal immunochemical test (FIT) may be done, or you may be referred to a specialist.
- Keep iron tablets out of the reach of children: an overdose can be fatal in a young child.
Do not start iron tablets on your own because your eyelid looks pale. Too much iron is harmful, and the cause of the iron loss, which can be serious, needs to be found.
Eye findings caused by anemia generally improve once the anemia is treated. In the published cases above, bleeding, optic disc swelling and other findings resolved after the anemia and its cause were treated. The risk is when swelling of the optic nerve goes on long enough to damage it, which is why an early eye examination matters.
When should you have your eyes examined?
Get urgent eye care (the same day) if you have:
- a sudden loss or blackout of vision in one or both eyes
- blurred or double vision together with a new, severe or worsening headache
- a curtain or shadow across your vision, or sudden new floaters or flashes
Book an eye examination soon if you have:
- a confirmed low haemoglobin of around 9 g/dl or lower (the range in which retinal changes were found in one study), particularly if it is falling
- anemia with any change in vision, even if mild
- a diagnosis of papilledema or suspected raised pressure around the brain (a blood count is part of the work-up)
At Laser Istanbul Clinic, retinal conditions are reviewed by Doç. Dr. Muhammet Derda Özer (Doç. means Associate Professor; retina, uveitis and ocular oncology) and Op. Dr. Aysan Bayram (retinal disease). A retinal examination with OCT imaging shows whether the retina, choroid and optic nerve head are affected. We assess the eye and tell you what we find; treating the iron deficiency itself stays with your GP or haematologist.
Frequently asked questions
Anemic eyes look much like normal eyes from the outside. The difference is on the inside of the lower eyelid, where the lining is usually pink to red and becomes paler in anemia. This pallor is a hint only: in a 2023 review it detected anemia between 19% and 97% of the time, and a blood test is needed to confirm it.
Sit in daylight, gently pull down your lower eyelid and look at the colour of the inner lining. Paler pink or pink-white raises suspicion of anemia. A pink lining does not rule it out, so ask your GP for a haemoglobin and ferritin blood test if you have symptoms.
Yes. Your iron stores (ferritin) can be low while your haemoglobin is still normal, so your eyelids can look normal and your haemoglobin result can be normal too. A ferritin test finds this stage; at 30 micrograms per litre, a Cochrane review found it 79% sensitive and 98% specific for iron deficiency.
Low ferritin does not change how your eyes look by itself. It signals that iron is running low before anemia develops. Eye effects, such as retinal changes, have mainly been described in more severe anemia, not in mild iron deficiency.
It can be associated with it. In a 2019 pilot study, a blue tint to the white of the eye was more common in people with iron deficiency, whether or not they were anemic. It is not specific, so a blood test is needed.
Severe anemia can cause bleeding and swelling in the retina, and anemia is linked to optic nerve swelling with raised pressure around the brain. In one 2023 study, 30% of eyes in anemic patients had retinopathy. Blurred vision, a blackout or a headache with vision change needs an urgent eye examination.
Not reliably today. Research models trained on standardised eyelid images reached 84.9% accuracy on their original dataset but 71.6% in a test on 101 new patients. Photos you take at home vary with lighting and camera settings, so a blood test remains the dependable check.
In published cases, retinal bleeding and optic disc swelling resolved after the anemia and its cause were treated. Recovery depends on how long the problem lasted and whether the optic nerve was damaged. Your doctor repeats blood tests over several months, and an eye examination shows whether your eyes have recovered.
Worried about changes in your vision?
If you have anemia or iron deficiency and notice blurred vision, floaters or changes in your sight, the surgeons at Laser Istanbul Clinic can examine your retina and optic nerve and tell you honestly what they find. Retina and uveitis are the field of Doç. Dr. Muhammet Derda Özer, and retinal disease is also treated by Op. Dr. Aysan Bayram.
Sources for the facts on this page
- NHS. Iron deficiency anaemia. https://www.nhs.uk/conditions/iron-deficiency-anaemia/
- NHS. Iron deficiency anaemia: causes. https://www.nhs.uk/conditions/iron-deficiency-anaemia/causes/
- NHS. Iron deficiency anaemia: diagnosis. https://www.nhs.uk/conditions/iron-deficiency-anaemia/diagnosis/
- NHS. Iron deficiency anaemia: treatment. https://www.nhs.uk/conditions/iron-deficiency-anaemia/treatment/
- World Health Organization. Anaemia (fact sheet; 2019 prevalence estimates). https://www.who.int/news-room/fact-sheets/detail/anaemia
- Vyas N, Hendren S, et al. The Accuracy of Physical Examination to Diagnose Anemia Among Patients Five Years or Older: A Systematic Review. Indian Journal of Hematology and Blood Transfusion 2023. PMID 36699436. https://pubmed.ncbi.nlm.nih.gov/36699436/ (PMC9868202)
- Chalco JP, Huicho L, Alamo C, Carreazo NY, Bada CA. Accuracy of clinical pallor in the diagnosis of anaemia in children: a meta-analysis. BMC Pediatrics 2005. PMID 16336667. https://pubmed.ncbi.nlm.nih.gov/16336667/
- Dimauro G, Griseta ME, Camporeale MG, Clemente F, Guarini A, Maglietta R. An intelligent non-invasive system for automated diagnosis of anemia exploiting a novel dataset. Artificial Intelligence in Medicine 2023. DOI 10.1016/j.artmed.2022.102477. https://pubmed.ncbi.nlm.nih.gov/36710064/
- Lin ET, Lu SC, Liu AS, et al. Deep Learning-Based Model for Non-invasive Hemoglobin Estimation via Body Parts Images. Journal of Imaging Informatics in Medicine 2025. DOI 10.1007/s10278-024-01209-4. https://pubmed.ncbi.nlm.nih.gov/39160365/
- Lobbes H, Dehos J, Pereira B, et al. Computed and Subjective Blue Scleral Color Analysis as a Diagnostic Tool for Iron Deficiency: A Pilot Study. Journal of Clinical Medicine 2019. DOI 10.3390/jcm8111876. https://pubmed.ncbi.nlm.nih.gov/31694276/
- Kano Y. Blue sclera: An overlooked finding of iron deficiency. Cleveland Clinic Journal of Medicine 2022;89(10):549–550. DOI 10.3949/ccjm.89a.22045. https://pubmed.ncbi.nlm.nih.gov/36192019/ (title used for the "overlooked sign" wording; abstract not available)
- Garcia-Casal MN, Pasricha SR, Martinez RX, Lopez-Perez L, Peña-Rosas JP. Serum or plasma ferritin concentration as an index of iron deficiency and overload. Cochrane Database of Systematic Reviews 2021. DOI 10.1002/14651858.CD011817.pub2. https://pubmed.ncbi.nlm.nih.gov/34028001/
- Venkatesh R, Gurram Reddy N, Jayadev C, Chhablani J. Determinants for Anemic Retinopathy. Beyoglu Eye Journal 2023. DOI 10.14744/bej.2023.05658. https://pubmed.ncbi.nlm.nih.gov/37521879/
- Toh ZH, Chin CF, Gan NY. Case of unilateral anaemic retinopathy unmasking colorectal carcinoma. BMJ Case Reports 2022. DOI 10.1136/bcr-2021-248029. https://pubmed.ncbi.nlm.nih.gov/35228244/
- Yumusak E, Ciftci A, Yalcin S, et al. Changes in the choroidal thickness in reproductive-aged women with iron-deficiency anemia. BMC Ophthalmology 2015. DOI 10.1186/s12886-015-0163-3. https://pubmed.ncbi.nlm.nih.gov/26715579/
- Yu CW, Waisberg E, Kwok JM, Micieli JA. Anemia and Idiopathic Intracranial Hypertension: A Systematic Review and Meta-analysis. Journal of Neuro-Ophthalmology 2022. PMID 34812762. https://pubmed.ncbi.nlm.nih.gov/34812762/
- Biousse V, Rucker JC, Vignal C, Crassard I, Katz BJ, Newman NJ. Anemia and papilledema. American Journal of Ophthalmology 2003. PMID 12654358. https://pubmed.ncbi.nlm.nih.gov/12654358/
- Deb AK, Subramaniam S, Sarkar S, et al. Branch retinal artery occlusion as an initial ocular manifestation of severe iron deficiency anemia: A rare case report. Taiwan Journal of Ophthalmology 2022. PMID 35813796. https://pubmed.ncbi.nlm.nih.gov/35813796/ (title only)
- Zehetner C, Bechrakis NE. White centered retinal hemorrhages in vitamin B12 deficiency anemia. Case Reports in Ophthalmology 2011. PMID 22087102. https://pubmed.ncbi.nlm.nih.gov/22087102/ (title only)