Cataract surgery: how does it work?

Inside the eye is the lens, a small, clear natural lens that helps focus. Over the years, this lens can lose its transparency and become cloudy: this is a cataract. Vision fogs up gradually, as if behind a misted window, sometimes with sensitivity to light and colours that look duller.

In Morocco, a cataract is often called “الماء الأبيض” (the white water) — not to be confused with “الماء الأزرق” (the blue water), which refers to glaucoma, a different disease. This confusion is common: only an examination by an ophthalmologist can tell them apart.

A cataract develops slowly. Surgery is considered when the loss of vision interferes with daily life: reading, driving, recognising faces, working. There is no single rule: it is your visual comfort, assessed together with your ophthalmologist, that guides the decision. Today, cataract surgery is one of the most commonly performed procedures in the world.

The operation is generally done as a day case (you go home the same day) and most often takes little time. The surgeon removes the lens that has become opaque, through a very small opening, and puts a clear implant in its place — an artificial lens that stays permanently in the eye.

The anaesthesia is most often local, with drops or a small injection around the eye: you are awake, but the eye is numbed and you feel no pain. A team supports and reassures you throughout the procedure.

This is a very widespread worry. Rest assured: the eye is not plunged into darkness, but you do not see the details of what is happening. Most often, you perceive lights, colours and blurred shapes, without a sharp image. Thanks to the anaesthesia, there is no pain. It is important to stay relaxed and follow the team's instructions during the procedure.

Vision may be a little blurred or the eye a little sensitive in the very first days, then it improves gradually. A course of eye drops is prescribed for a few weeks to support healing and prevent infection.

During this period, a few precautions are usual: not rubbing the eye, avoiding dust, unclean water and intense effort, and keeping to the follow-up appointments. The exact instructions are given to you by your ophthalmologist and take precedence over any general information.

Cataract surgery is well established, but like any procedure it carries risks, generally uncommon: infection, inflammation, retinal detachment or late clouding of the membrane behind the implant (a so-called “secondary” cataract, which is treated with a laser). Your ophthalmologist informs you of these risks and obtains your consent before the operation.