But with time, the lens gradually turns more densely yellow and further clouds your vision.Īs the cataract slowly progresses, the lens may even turn brown. A nuclear cataract may at first cause more nearsightedness or even a temporary improvement in your reading vision. Types of cataractsĬataracts affecting the center of the lens (nuclear cataracts). The cataract in one eye may be more advanced than the other, causing a difference in vision between eyes. As a result, your vision becomes blurred.Ĭataracts generally develop in both eyes, but not always at the same rate. A cataract scatters and blocks the light as it passes through the lens, preventing a sharply defined image from reaching your retina. Age-related and other medical conditions cause proteins and fibers within the lenses to break down and clump together, clouding the lenses.Īs the cataract continues to develop, the clouding becomes denser. The lens focuses light that passes into your eye, producing clear, sharp images on the retina - the light-sensitive membrane in the eye that functions like the film in a camera.Īs you age, the lenses in your eyes become less flexible, less transparent and thicker. The lens is positioned behind the colored part of your eye (iris). How a cataract formsĪ cataract is a cloudy lens. Long-term use of steroid medications, too, can cause cataracts to develop. Cataracts can also be caused by other eye conditions, past eye surgery or medical conditions such as diabetes. Some inherited genetic disorders that cause other health problems can increase your risk of cataracts. Proteins and fibers in the lens begin to break down, causing vision to become hazy or cloudy.
Most cataracts develop when aging or injury changes the tissue that makes up the eye's lens.
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