Cataract

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Definition

A cataract is a clouding of the eye's lens. It leads to decreased vision. The lens of the eye focuses an image onto the retina at the back of the eye. This is where an image is processed, and then sent to the brain.As the cataract matures, it often causes glare, and decreased vision, contrast, and color sensitivity.
Cataract
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Causes

The lens of the eye is made of mostly water and protein. The protein is arranged in a way that keeps the lens clear so light can pass through it. A cataract forms when some of the protein clumps together and starts to cloud an area of the lens. A cataract won't spread from one eye to the other, although most people develop cataracts in both eyes at similar times.There are several causes of cataracts, including:
  • Aging, the most common cause
  • Smoking
  • Diabetes
  • Certain infections
  • Exposure to radiation, certain toxins, or medications
  • Taking adrenal cortical hormones for a long time
  • Birth defect, inborn error of metabolism, or chromosomal abnormality

Risk Factors

Factors that may increase your chance of a cataract include:

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