Cataracts are one of the most common — and most treatable — causes of vision loss in the world. By age 80, more than half of all Americans either have a cataract or have had cataract surgery. Despite how common they are, many people do not fully understand what cataracts are, what they feel like as they develop, or what modern surgery actually involves. This guide covers everything you need to know.
What Is a Cataract?
The eye’s natural lens is a clear, flexible structure that sits just behind the iris. It works with the cornea to focus light onto the retina, producing sharp images. As we age, proteins in the lens can begin to clump together and yellow, causing the lens to become cloudy — this is a cataract. The cloudiness grows gradually, and at first most people experience only minor visual changes. Over time, however, the lens can become opaque enough to seriously impair everyday activities.
Cataracts most often develop due to the natural aging process, but they can also result from injury to the eye, prolonged steroid use, poorly controlled diabetes, previous eye surgery, radiation exposure, or certain genetic conditions. In rare cases, infants are born with congenital cataracts.
How Cataracts Affect Vision
The visual changes caused by cataracts depend on where in the lens the cloudiness develops and how dense it becomes. Common symptoms include blurred or dim vision that cannot be corrected to the same sharpness as before with glasses, increased sensitivity to bright light and glare from headlights or sunlight, the appearance of halos around lights, colors seeming faded or yellowed, double vision in the affected eye, and more frequent changes in glasses prescription. Some people notice that their reading vision temporarily improves in early cataract development — a phenomenon sometimes called “second sight” — before the cataract progresses and vision deteriorates again.
When Is Surgery Needed?
Not every cataract requires surgery. In the early stages, stronger glasses or brighter lighting may provide adequate vision for daily life. Surgery becomes appropriate when cataracts interfere with activities that matter to you — reading, driving, working, or enjoying hobbies — and when the risks of surgery are outweighed by the potential benefits. Your eye doctor will monitor the progression of your cataracts and help you decide when the timing is right.
Cataract surgery should not be indefinitely delayed once it begins to affect quality of life or safety. Very advanced cataracts can become harder to remove and carry a slightly higher risk of complications.
What Modern Cataract Surgery Involves
Cataract surgery is one of the safest and most refined surgical procedures in medicine. It is performed as an outpatient procedure under local anesthesia (numbing eye drops), typically taking 15 to 30 minutes per eye. The surgeon makes a tiny incision in the cornea, uses ultrasound energy to break up the cloudy lens (phacoemulsification), removes the fragments, and replaces the natural lens with a clear artificial intraocular lens (IOL) implant.
Several types of IOLs are available. Monofocal lenses provide excellent focus at one distance — usually far — and most patients need reading glasses for near tasks afterward. Toric IOLs correct astigmatism. Multifocal or extended depth-of-focus IOLs reduce the need for glasses at both near and far distances, though they can produce more glare or haloes at night.
Recovery is usually straightforward. Vision often improves within a day or two, though mild blurring and light sensitivity for a week or two are normal. Eye drops are prescribed to prevent infection and reduce inflammation. Most patients can resume normal activities quickly, with strenuous exercise and swimming avoided for a few weeks.
If you are experiencing symptoms of cataracts or have been told a cataract is developing, our team can provide a thorough evaluation and discuss your options. Visit our eye care services page for more information, or find an eye care provider near you.