Replacement Lens Surgery Advantages and Disadvantages: What to Know Before RLE

Most patients notice some light scatter and unwanted images in the early months after RLE, according to the RCOphth. A shadow or shimmering arc at the edge of vision is common with any lens. Some multifocal lenses tend to cause halos around lights; others cause blur or ghost images. The NHS says glare, halos, starbursts and ghost images normally improve within a few months.

Multifocal lenses split light between several focus points, which is how they give you near, intermediate and distance vision, and the price is more optical side effects. A review by Alió and colleagues notes that this can bring halos, glare and lower contrast sensitivity. The American Academy of Ophthalmology (AAO) says these effects are especially true at night or in dim light, and that people who drive a lot after dark may want to avoid multifocal or EDOF lenses, although most people adapt.

What the trials show for one widely used trifocal lens: in the US Food and Drug Administration (FDA) approval study of the AcrySof IQ PanOptix lens, starbursts were the symptom patients most often said bothered them "very much" at 6 months, at 4.8% of patients, compared with 0.9% for the monofocal control lens. Binocular contrast sensitivity was slightly reduced compared with the monofocal lens, but the difference was not judged clinically meaningful.

Do halos go away? For most people they fade. The RCOphth reports that 19 out of 20 patients are satisfied or very satisfied with their vision three to six months after multifocal lens surgery. But side effects "do not always resolve completely", and approximately 1% of multifocal patients cannot adapt and choose to have the multifocal lens swapped for a monofocal one, which the RCOphth describes as a potentially complicated procedure.

Unwanted images also occur with monofocal lenses. A 2022 review of dysphotopsia, the medical term for these effects, reports that after cataract surgery up to 67% of patients notice glare, streaks or halos early on, that symptoms settle spontaneously in most, and that in up to 2.2% they last for a year. A different problem, a dark crescent or shadow in the side vision, called negative dysphotopsia, affects up to 26% of patients early on and persists at one year in 0.13% to 3%.

RLE does not promise a life without glasses. With a monofocal lens set for distance, you will normally still need reading glasses (RCOphth, AAO). Even with multifocal lenses, about one in five patients is not completely free of glasses. Two further things can leave a small prescription behind:

• Lens-power calculation has limits. The RCOphth explains that the formulas and eye measurements used to choose your lens have limits in accuracy, so a laser touch-up to fine-tune the focus is sometimes needed. Our policy on touch-ups: {{laser touch-up and YAG capsulotomy policy and the period it covers}}.
• Dry or uneven eye surface. A study of 74 eyes at one US eye centre (Gibbons et al., 2016) looked at patients who were unhappy after presbyopia-correcting lenses. Their most common causes of complaint were residual refractive error (57%) and dry eye (35%). This is a group selected for dissatisfaction, so it shows what goes wrong, not how often. Most could be helped without further surgery, but 32% were still completely dissatisfied after treatment and 7% needed their lens exchanged.

Some surface discomfort is common in the early months after any eye surgery. The RCOphth says it is usually mild after RLE, often affects one eye more than the other, and responds to lubricating drops; for patients with a normal eye surface before surgery, lasting problems are unusual. A 2020 review (Naderi et al.) notes that dry eye disease is common and can be made worse by cataract surgery, which is why surgeons should look for it and treat it before the operation.

The thin membrane that holds the new lens can become cloudy, called posterior capsule opacification (PCO). According to EyeWiki, the AAO's clinical encyclopedia, PCO occurs in 20–50% of patients within 2 to 5 years of cataract surgery. The RCOphth says it is the commonest reason for vision to deteriorate after RLE and that a one-off minor laser procedure, YAG capsulotomy, normally treats it successfully. YAG treatment has its own small risks, including retinal detachment and raised eye pressure (EyeWiki), and the RCOphth notes that clinics may charge a fee for it. Ask whether it is included before you book: {{laser touch-up and YAG capsulotomy policy and the period it covers}}.

RLE is intraocular surgery, so the stakes are higher than for laser on the surface of the cornea. These are the figures to weigh:

Very short-sighted eyes need extra care. Older published series of RLE in highly myopic eyes report retinal detachment rates from about 1.5–2.2% up to 8.1% (Alió et al., 2014), and the authors advise careful retinal examination beforehand. This is a main reason a dilated retinal check matters before surgery.

Know the warning signs. A sudden shower of new floaters, flashes of light (even with your eyes closed) or a shadow or curtain spreading across your vision can signal a retinal detachment. Most detachments can be repaired, and the chances are much better if treatment starts before the centre of vision is affected (RCOphth). Increasing aching pain, light sensitivity, redness or blur after surgery also need a same-day call to your surgeon.

Your natural lens, even a stiff one, is replaced for good. In people who can still focus up close, RLE removes that ability. That is why the RCOphth says laser eye surgery or an implantable lens are generally better options than RLE for younger patients who still have a clear, flexible lens, which includes most people under 50. Alió and colleagues likewise conclude that RLE should generally be performed only in presbyopic eyes (eyes that have already lost near focusing), and that loss of accommodation must be discussed thoroughly with younger patients.

Surgery to correct the need for glasses is not available as an NHS procedure and is not covered by private health insurance schemes, according to the RCOphth. In the US, the AAO says premium lenses are usually paid for out of pocket. With us, the price of lens replacement starts from {{£ price}} for both eyes, including pre-operative examination and scans, surgery by your named surgeon, medication, follow-up checks in Istanbul, a personal interpreter, a coordinator and remote follow-up. Flights, hotel and airport transfers are not included; hotel and transfers are a separate charge we arrange on request.

If your lens is already cloudy and you are weighing a private operation against an NHS wait, the position is different from RLE: at the end of July 2026, NHS England had 620,931 ophthalmology patients waiting to start treatment, and 72.9% had been waiting under 18 weeks, below the 92% standard. Waits vary by hospital.