noun. transparent, biconvex tissue that helps bring rays of light to focus on the retina
The lens allows your eye to focus on objects at varying distances. The most common disease associated with clouding or the opacity of the lens is known as:
noun. is when your eye's natural lens becomes cloudy
Inside our eyes, we have a natural lens. The lens bends (refracts) light rays that come into the eye to help us see. The lens should be clear, like the lens in the illustration above.
If you have a cataract, your lens has become cloudy, like the bottom lens in the illustration. It is like looking through a foggy or dusty car windshield. Things look blurry, hazy or less colorful with a cataract.
Aging is the most common cause. This is due to normal eye changes that begin to happen after age 40. That is when normal proteins in the lens start to break down. This is what causes the lens to get cloudy. People over age 60 usually start to have some clouding of their lenses. However, vision problems may not happen until years later.
Other reasons you may get cataracts include:
having parents, brothers, sisters, or other family members who have cataracts
having certain medical problems, such as diabetes
having had an eye injury, eye surgery, or radiation treatments on your upper body
having spent a lot of time in the sun, especially without sunglasses that protect your eyes from damaging ultraviolet (UV) rays
using certain medications such as corticosteroids, which may cause early formation of cataracts.
Most age-related cataracts develop gradually. Other cataracts can develop more quickly, such as those in younger people or those in people with diabetes.