Cataract: when to have it done, and how the lens gets sold to you

The two myths that push people in opposite directions

The first myth is that a cataract must be ripe before it can be removed. This dates from an era of different surgical technique and it is no longer true. Modern phacoemulsification uses ultrasound to break up the lens through a very small incision, and a softer, less advanced cataract is generally easier and safer to remove than a rock-hard mature one. Waiting for ripeness can produce a denser lens, a longer operation and a higher chance of complications. If you are being told to come back when it is ripe while your vision is already interfering with your life, that advice is out of date.

The second myth runs the other way: that a cataract seen on examination must be operated on now, urgently, today. A cataract that is not yet affecting what you do can reasonably be left alone and reviewed. Cataracts generally progress slowly over years. A small lens opacity found incidentally is not a reason for surgery next week.

The genuine criterion sits between the two, and it is about you rather than about the lens. Surgery is appropriate when the cataract interferes with the activities that matter in your life: reading, recognising faces, cooking safely, working, walking outside without stumbling, or driving, particularly driving at night when glare from oncoming headlights becomes disabling. That is a judgement you make with information, not a number a machine produces.

There are a few situations where a cataract genuinely does need removing regardless of how well you think you see: when it is so dense the retina cannot be examined in someone with diabetes who needs that examination, when it is causing raised pressure inside the eye, and in babies and young children where an untreated cataract prevents vision from developing at all. In children this is time-critical.

One further point on timing that gets lost: an untreated cataract does eventually cause severe visual loss and blindness, and in India cataract remains a leading cause of avoidable blindness. So the message here is not to avoid the operation. It is to have it at the point where it helps you, on terms you understand.

The lens conversation, which is where the money is

During surgery your clouded natural lens is removed and an artificial intraocular lens is put in its place. That lens is permanent, and its type determines both your visual result and, in most Indian hospitals, the largest single variable in your bill.

A monofocal lens focuses at one distance. Almost always that is set for distance, and you wear reading glasses for close work. Monofocal lenses give excellent, crisp vision at their focal distance, have the longest track record, cause the least trouble with glare, and are the least expensive. For the majority of people this is the right choice, and choosing it is not settling for something inferior.

A toric lens corrects astigmatism, meaning an irregular corneal curvature. This is not a lifestyle upgrade; it addresses a measurable optical problem. If you have significant astigmatism, a toric lens can meaningfully improve your uncorrected vision. If you do not, it does nothing for you. So the honest question is simply: how much astigmatism do I have on measurement, and is it enough to justify this lens?

A multifocal or extended depth of focus lens attempts to give usable vision at more than one distance, reducing dependence on glasses. What you are buying is spectacle independence, not sharper vision. The recognised trade-offs are glare and haloes around lights at night, which most people adapt to and a minority find genuinely troublesome, and slightly reduced contrast. They are a poor choice for people who drive a lot at night, and they perform badly in eyes that have other retinal or corneal disease. Someone whose work is detailed close-up handwork and who is entirely comfortable wearing glasses may gain very little.

Prices in India span a wide range, with premium lenses commonly costing several times a standard monofocal. That gap is where the pressure comes from. It is entirely reasonable to ask what specifically the premium lens will let you do that a monofocal will not, whether your eye is a good candidate on measurement, and what the chance is that you still need glasses afterwards.

Two practical safeguards. First, ask for the recommendation and its reasons in writing before the day of surgery, because a lens choice made on a trolley outside the theatre is not a decision. Second, if you are having a scheme-funded or insured procedure, ask exactly what lens is covered and what the top-up buys, since being told the covered lens is of poor quality is a very common sales line and standard monofocal lenses used in public and scheme-funded surgery are perfectly good lenses.

Screening camps, and how to use them well

Free eye camps have done enormous good in India and have restored sight to very large numbers of people who would otherwise have gone blind. Nothing here suggests avoiding them. But a camp is a screening exercise, and screening detects; it does not decide.

Reported patterns are consistent: a large number of attendees told on the same day that they need surgery, transport offered immediately, and admission the same evening. Some of that is genuinely efficient care for people who would never otherwise return. Some of it is volume-driven.

What protects you costs nothing. Ask for your findings in writing, including your measured vision in each eye and the reason surgery is advised. Ask whether it is safe to have the surgery in two or three weeks rather than tonight; for almost every adult cataract, it is. Take that paper to any other qualified eye doctor, including a government hospital, and ask the same question. If the advice matches, proceed with more confidence than you had before.

Be alert to two specific things. First, whether both eyes are being scheduled together; standard practice is to operate one eye first, confirm the result, then do the second, usually after a gap. Second, whether the free surgery you were promised has become a paid procedure because of a lens upgrade recommended after you arrived.

What can go wrong, stated plainly

Cataract surgery is among the safest and most effective operations performed anywhere, and the great majority of people have an uncomplicated procedure and better vision. Being told about complications is not a reason to refuse; it is what lets you recognise a problem early.

Endophthalmitis, an infection inside the eye, is rare but is the complication that can destroy vision, and it usually announces itself in the first days to weeks with increasing pain, worsening vision and marked redness. Increasing pain and decreasing vision after cataract surgery is never something to sleep on. It is an emergency, that night if necessary.

Retinal detachment is uncommon but more likely in short-sighted eyes, and shows itself as a shower of new floaters, flashes, or a shadow or curtain moving across the vision. This also needs same-day assessment.

Other recognised issues: swelling at the centre of the retina causing blurred vision some weeks later, a lens that ends up slightly off the intended power so you need glasses you did not expect, raised eye pressure, and inflammation that takes longer than usual to settle.

Posterior capsular opacification deserves separate mention because it frightens people unnecessarily. Months or years after successful surgery, the thin membrane behind the lens can cloud, and vision gradually dims again. Patients often assume the cataract has returned. It has not; a cataract cannot come back once the lens is removed. This is treated with a quick outpatient laser procedure called YAG capsulotomy, which takes minutes and needs no incision. Ask whether it is included in your package or charged separately.

Finally, one honest caution about expectations. If you also have glaucoma, diabetic retinal disease or macular degeneration, removing the cataract removes only the cataract. Your vision may improve considerably less than someone with an otherwise healthy eye. Ask directly, before surgery, what vision you can realistically expect given the rest of your eye, and be wary of anyone who promises perfect vision without examining your retina.