Some signs of cataracts in humans include clouded vision, difficulty seeing at night, light sensitivity, fading colors, double vision and changing eyeglasses frequently, states Mayo Clinic. At first, clouded vision tends to affect only a small part of the eye's lens. The symptoms become apparent when the cataract grows larger.
A cataract is an eye condition characterized by clouded vision and can lead to vision impairment, explains WebMD. It tends to block light from entering the eye, making it hard to see clearly. If not treated early enough, a cataract can lead to blindness over time. It commonly affects people aged 65 years and older. There are several types of cataracts, including age-related cataracts, secondary cataracts, congenital cataracts and traumatic cataracts.
Cataracts occur when there is an accumulation of protein in the lens, leading to cloudiness, says WebMD. This obstructs the penetration of light through the lens, causing poor vision. Because new lens cells develop outside the lens, the older cells build up at the center of the lens, leading to a cataract. Factors that increase the chances of getting a cataract include heavy use of alcohol, smoking and air pollution. It is necessary to make an appointment with an optician when there is any change in vision.