Refractive Lens Exchange (Lens Replacement Surgery)

Most people who come to see Mr Modi about lens replacement have reached the same point. The reading glasses have crept onto every surface in the house. The varifocals are fine, until the light is poor or the menu is small. Contact lenses have stopped being comfortable for a full day. Nothing is wrong, exactly, but the workarounds have started to add up.

Refractive lens exchange is the operation that removes that problem at its source. The natural lens inside the eye, which has stiffened with age and lost its ability to focus up close, is replaced with an artificial lens chosen to give you the range of vision you actually want.

Mr Modi performs this surgery at Frimley Park Hospital in Camberley, at Spire Clare Park Hospital in Farnham and at Mount Alvernia in Guildford, seeing patients from across Surrey, north-east Hampshire and east Berkshire.

Enquiries

How this differs from cataract surgery

The two operations are technically almost identical. In both, the natural lens is removed through a 2.2mm incision and an artificial lens is placed in its position.

The difference is the reason for doing it.

Cataract surgery is performed because the natural lens has become cloudy and is obstructing vision. There is a clinical problem to solve, and it will only worsen if left alone.

Refractive lens exchange is performed on a clear lens, in an eye that sees perfectly well with glasses. There is nothing wrong that needs fixing. You are choosing the operation to reduce your dependence on spectacles, and that changes the calculation entirely. The surgical risk is the same, but the threshold for accepting it has to be higher, because you are trading a functioning eye for a better one rather than restoring a failing one.

That distinction matters more than anything else on this page, and it governs how Mr Modi assesses everyone who enquires.

One consequence worth knowing early: because the natural lens is removed, you will never develop a cataract. If you are in your late fifties or sixties, you were statistically likely to need cataract surgery eventually anyway. Lens exchange brings that operation forward and takes the opportunity to correct your focus at the same time.

Who this suits

Lens replacement tends to work well if you recognise yourself in most of the following.

You are over 55. Below that age the natural lens usually retains some focusing ability, and there is more to lose by removing it.

You are long-sighted, or you have become increasingly dependent on reading glasses and varifocals. Long-sighted patients in particular do very well, because they often have the poorest quality of vision without correction and gain the most.

You have been told you are not suitable for laser vision correction, or you are outside the range where laser gives reliable results. Above roughly +3 dioptres of hypermetropia, or with high myopia, lens-based surgery is usually the better answer.

Your eyes are otherwise healthy. No significant glaucoma, no macular disease, no corneal dystrophy, no history of retinal detachment.

You want to be less reliant on glasses, but you understand that "less reliant" is not the same as "never wearing glasses again".

Who I turn down, and why

In Mr Modi's own words:

I decline this operation more often than I perform it, and I would rather explain that here than at the end of a consultation you have paid for.

If you are under 50 and short-sighted. Removing a clear lens from a myopic eye carries a meaningfully raised lifetime risk of retinal detachment, and in a younger eye you are also giving up natural accommodation you still possess. Laser correction, or a phakic implantable lens, is almost always the better route.

If your macula is not healthy. Extended range and multifocal lenses divide or spread the available light. That works when the retina is in good order and is unforgiving when it is not. If there is early macular degeneration or an epiretinal membrane, a premium lens will disappoint you.

If you have significant dry eye or blepharitis that has not been treated. The tear film is the first refractive surface of the eye. If it is unstable, your vision will fluctuate no matter how good the lens or how accurate the biometry. I treat this first, and I have a full dry eye service for exactly this reason. Sometimes patients find that once the ocular surface is settled, their vision is good enough that they no longer want surgery at all.

If you have glaucoma or are a glaucoma suspect. This is not an absolute bar, and as the glaucoma lead at Frimley Park I am comfortable managing both conditions together. But it changes which lenses are sensible, and it needs discussing properly.

If your expectations do not match what the technology can deliver. Some people want perfect, effortless, glasses-free vision at every distance in every light. That does not exist. If, having heard the honest version, that is still what you are hoping for, I will tell you that this operation will not make you happy.

Lens options

The lens choice matters more than the surgery. The operation itself is highly standardised; the outcome you experience for the next thirty years is determined by which lens goes in and how accurately it is calculated.

Rayner Galaxy

For most refractive lens exchange patients, this is where Mr Modi starts. The Galaxy uses a continuous spiral optic, designed with the help of artificial intelligence, rather than the concentric diffractive rings found in conventional multifocal lenses. It gives a smooth, uninterrupted range of focus from distance through to near, with no discrete focal points and no loss of light.

Its practical advantage is at night. Diffractive multifocal lenses split incoming light into separate focal points, and the light that is not being used at any given moment is what patients perceive as halos and glare around headlights. The Galaxy's non-diffractive design largely avoids this. For anyone who drives in the dark, that is often the deciding factor.

Mr Modi was the first surgeon in Surrey and Hampshire to implant this lens, in December 2024, and has used it extensively since.

[Read about the first Rayner Galaxy implantation in Surrey and Hampshire]

Extended depth of focus (EDOF) lenses

These give excellent distance and intermediate vision with a good quality of image and very few night-time visual disturbances. Fine reading print usually still requires glasses. They are a sensible choice if you are cautious, if your priority is a clean, natural image, or if there is any question over your retinal health.

Trifocal lenses

These provide the widest spectacle independence, including small print, but they achieve it by dividing light into three focal points. Some halo and glare at night is part of the bargain. For patients who read a great deal and drive very little, they remain a good option.

Toric lenses

If you have significant astigmatism, any of the above can be supplied in a toric form and rotated into precise alignment during surgery. Without this, astigmatism will limit the result whatever else is done.

Blended vision

Rather than fitting the same lens to both eyes, the two eyes can be set to slightly different focal points and allowed to work together. This suits some people extremely well, whereas a small number never adapt to it. Mr Modi discusses it where it is appropriate and never imposes it.

[Read more about lens choices]

Your assessment

Mr Modi will not agree to operate on the basis of a telephone conversation or a brief chat. The assessment is crucial to the operation, in the sense that everything that determines your result is decided before you reach theatre.

At your consultation he will carry out a full examination of both eyes, including the retina with the pupils dilated, and a formal assessment of the ocular surface and tear film. He will measure your eyes with optical biometry, examine your corneal topography for irregular astigmatism, and perform OCT imaging of the macula and optic nerve. Dilating drops blur the vision for several hours, so please arrange not to drive afterwards.

You will then talk about what you actually do with your eyes. Not in general terms, but specifically: what your work involves, how much you drive at night, whether you read paper or a screen, whether you play sport, how much it would bother you to keep a pair of reading glasses in the car. The lens choice follows from that conversation, and Mr Modi would rather have it properly than quickly.

You will receive a written summary of the findings and the plan, and a full quotation, before you commit to anything.

The surgery

The operation takes around fifteen minutes per eye and is performed under local anaesthesia with eye drops. You are awake but the eye is completely numb, and you will not see anything alarming. Sedation is available if you would prefer it.

Mr Modi makes a 2.2mm incision, breaks up and removes the natural lens by phacoemulsification, and inserts the new lens through a preloaded injector. It unfolds into position inside the capsule that held your natural lens. No stitches are needed; the incision is self-sealing.

You go home the same day with a plastic shield over the eye, which stays on overnight and for a week at night.

Some patients choose to have both eyes on the same day, which is safe in carefully selected cases and which Mr Modi is happy to discuss. Alternatively, the second eye can be operated a few weeks after the first.

Recovery and what to expect

Vision is usually noticeably clearer by the following day and continues to sharpen over two to four weeks.

You will use antibiotic and anti-inflammatory drops for about four weeks. Avoid rubbing the eye, keep water and eye make-up away for a week, and leave swimming and heavy lifting for a fortnight. Most people are back at a desk within two or three days.

Mr Modi will see you postoperatively in the few weeks after surgery. Every patient he operates on is reviewed by him personally. There is no handover to a colleague you have not met, and if something concerns you between appointments you contact the clinic directly.

There are two things worth knowing in advance.

Neuroadaptation. With extended range and multifocal lenses, the brain has to learn to interpret a new kind of image. For most people this takes a few weeks. For a minority it takes several months, and during that period the vision can feel odd rather than obviously better. This is normal and it is not a sign that anything has gone wrong.

Fine-tuning. Modern biometry is accurate but not perfect. A small number of patients need an adjustment postoperatively or, rarely, a lens exchange to reach the intended target. It is better to know that this is an uncommon but recognised part of the pathway than to be surprised by it.

Risks

Refractive lens exchange is a safe operation, but it is intraocular surgery on a healthy eye and it is not risk-free.

The most serious complication is endophthalmitis, an infection inside the eye, which occurs in approximately 1 in 4,000 cases and can cause permanent loss of vision. Retinal detachment is uncommon but the risk is raised by lens surgery, particularly in short-sighted eyes. Other recognised complications include swelling of the macula, capsule rupture during surgery, corneal swelling and a lens that ends up slightly off its intended position.

Clouding of the posterior capsule develops in a proportion of patients over the following years and is treated straightforwardly in clinic with a YAG laser. As the laser lead at Frimley Park Hospital, Mr Modi performs this routinely with drop anaesthesia alone.

He will go through all of this with you in detail, in the context of your own eyes, before you decide anything.

[Read more about YAG laser capsulotomy]

Costs

You will be given a written, itemised quotation after your assessment, and there will be nothing in your final bill that was not on it. [Finance options over 12 or 24 months are available — details on request.]

Why patients choose Mr Modi for this

Mr Modi is a Consultant Ophthalmic Surgeon at Frimley Park Hospital, where he leads the glaucoma and laser services. He has performed over 5,000 cataract and lens procedures, including a large number of complex cases, and is a full member of the European Society of Cataract and Refractive Surgery.

Three things are worth saying plainly.

The first is that you see Mr Modi throughout. Your assessment, your surgery, your follow-up and any problem in between are all handled by the same surgeon. In a procedure where the outcome depends so heavily on the planning, having the person who did the planning also perform the operation is not a small detail.

The second is that he is not selling you an operation. A significant proportion of the people who enquire about lens replacement leave the clinic without booking one, either because their eyes are not suitable or because, having heard the honest version of the trade-offs, they decide they would rather keep their varifocals. That is the consultation working correctly.

The third is that he has access to the current generation of lens technology and the experience to know when it is worth using. Being first in the region with the Galaxy lens matters less than knowing which patients it suits and which it does not.

Where Mr Modi sees patients

NuVision Clinic, Camberley — private CQC-registered clinic, for consultations and assessment.

Frimley Park Hospital – consultation and surgery

Spire Clare Park Hospital, Farnham — consultation and surgery.

Mount Alvernia Hospital, Guildford — consultation and surgery.

Patients travel from Camberley, Farnham, Guildford, Woking, Frimley, Fleet, Farnborough, Aldershot, Bagshot, Ascot, Windlesham, Godalming, Cranleigh and across Surrey, north-east Hampshire and east Berkshire.

Frequently asked questions

Ready to find out whether this is right for you?

The first step is a full assessment, after which you will know exactly where you stand — including if the answer is that surgery is not the right choice for you.