Cataract Surgery

A cataract is the natural clouding of the eye's own lens, which sits behind the pupil and focuses light onto the retina. As the lens loses its transparency, usually with age, vision becomes blurred, dim or yellowed, glare increases and colours fade. Cataract surgery removes this clouded lens and replaces it with a clear artificial lens, called an intraocular lens, which is folded through a tiny opening and unfolds into the exact position the natural lens once held. The intraocular lens is chosen and calculated for each individual eye, and modern designs do far more than simply clear the vision. A standard monofocal lens gives sharp vision at one distance, while multifocal and trifocal lenses are designed to provide clear vision at several distances, so many patients see well for both reading and driving without glasses.

Cataract surgery is recommended when a clouded lens begins to interfere with everyday life, such as reading, driving, working or recognising faces, and glasses can no longer make vision comfortable. It is the only definitive treatment for a cataract, since the clouding cannot be reversed with drops or medication. The same lens-exchange technique is also chosen by some people without a cataract who want freedom from glasses, particularly those over forty whose natural lens has stiffened so they can no longer focus across near, intermediate and far distances, and those whose prescription is too high for laser correction. The decision, and the choice between a standard and a premium lens, is made together with the ophthalmologist after a full assessment of the eye.

The procedure is carried out with numbing eye drops while the patient lies comfortably awake, so no general anaesthesia is needed and nothing is felt. Through an incision of just a couple of millimetres, so small that it usually seals on its own without stitches, the surgeon uses fine ultrasound energy to gently break up and remove the clouded lens, a technique known as phacoemulsification. The clear intraocular lens is then folded, inserted through the same tiny opening, and positioned precisely where the natural lens was. The whole procedure takes only about 10 to 20 minutes per eye. The two eyes are operated on different days, usually a few days apart, so each can begin healing and be checked before the other is treated. Before surgery the eye is measured in detail to calculate the correct lens power and select the lens type that matches the patient's vision goals.

Most adults with a visually significant cataract are suitable, and there is no upper age limit; suitability depends on the overall health of the eye rather than age alone. Preparation begins with a thorough examination that measures the length and curvature of the eye, assesses the retina and optic nerve and screens for other conditions such as glaucoma, macular disease or diabetic changes that may affect the result. These measurements also determine the lens power and help the patient and surgeon choose between a standard lens and a multifocal or trifocal lens. Anti-inflammatory or antibiotic drops may be started before the operation. For international patients, a recent eye report can be reviewed in advance, while the precise biometry and lens decision are completed in person, since accurate on-site measurement is what makes the result sharp.

Recovery is quick and comfortable. There are no stitches and little or no pain, although vision is often hazy for the first day or two because the pupil has been dilated, and the eye may feel mildly gritty or watery. The eye is usually checked the day after surgery, and a course of eye drops is used for a few weeks to prevent infection and calm inflammation. When planning a trip abroad, it is sensible to allow about 5 to 7 days in the destination city so both eyes can be treated a few days apart and each reviewed before flying home. Air travel is generally comfortable once the surgeon confirms healing is on track, and a multifocal lens may take a little longer for the brain to adapt to at all distances. After returning home, follow-up continues remotely by message or video, with interpreters and patient coordinators available so language is never a barrier.

Cataract surgery is among the safest and most refined operations in medicine, with a very high success rate when performed by an experienced surgeon in a properly equipped centre, though as with any procedure some risk remains. Most patients experience only minor, temporary effects such as blurred vision, mild grittiness or watering that settle within days. Less common risks include infection, inflammation, raised eye pressure, swelling of the retina or a need for fine adjustment of the result; eyes that also have glaucoma, macular disease, diabetes or retinal disease are assessed especially carefully because they can carry a little more risk. Some months or years later the lens capsule behind the implant can become cloudy, which is easily and painlessly cleared in a brief laser visit. The great majority of patients regain clear, bright vision, and with a premium lens many also enjoy lasting freedom from glasses.