Lifestyle

5 Signs of Cataracts Most People Don’t Recognize Until Vision Loss Begins

By Erica Coleman · August 8, 2026

You assumed you just needed stronger reading glasses. Your ophthalmologist says half your lens is clouded over.

Cataracts are the leading cause of vision loss in adults over 40 and the most common cause of blindness worldwide. By age 75, more than half of Americans either have a cataract or have had cataract surgery. The condition develops so gradually that most people don’t notice it until their vision has significantly declined — because the early signs look like normal aging.

Colors look duller than they used to. Cataracts form when proteins in the lens break down and clump together, creating a yellowish or brownish tint that filters the light entering your eye. White pages may appear cream-colored. Bright colors may look muted. The change is so gradual that most people don’t notice until after cataract surgery, when they describe colors as looking “vivid” again for the first time in years.

Nighttime driving has become difficult. Halos around headlights, increased glare from oncoming traffic, and difficulty judging distance at night are among the earliest functional symptoms. The clouded lens scatters incoming light instead of focusing it cleanly on the retina. Many people respond by avoiding night driving entirely — without realizing the underlying cause is treatable.

Your prescription keeps changing but your vision doesn’t improve. Frequent changes to eyeglass prescriptions that don’t seem to sharpen your vision the way new glasses used to is a classic cataract signal. The lens itself is degrading, and no external correction can compensate for internal clouding. If your optometrist keeps adjusting your prescription without improvement, ask for a cataract evaluation.

You need brighter light to read. Gradually requiring more light to read a menu, a book, or a phone screen is easy to dismiss as eye fatigue. It’s actually one of the most common early cataract symptoms — the clouded lens reduces the amount of light reaching the retina, meaning you need more light to achieve the same clarity you had before.

Double vision in one eye. Unlike the double vision caused by eye alignment problems (which involves both eyes), cataract-related double vision occurs in a single eye. The clouded lens refracts light unevenly, creating a ghost image alongside the real one. Covering one eye and still seeing double is a distinctive symptom that warrants an immediate ophthalmology appointment.

Cataract surgery is one of the most commonly performed and safest procedures in medicine — roughly 4 million Americans have it done each year. The procedure takes 15 to 20 minutes, recovery is typically a few days, and the results are often dramatic. The only wrong decision is waiting until your vision has deteriorated to the point where daily life is impaired, because the surgery is just as effective — and much safer — when performed before the cataract becomes dense.