The lens of the eye is made of mostly water and protein. The protein is arranged in a way that keeps the lens clear and lets light 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 a similar times.
There are several causes of cataracts, including:
- Aging (the most common cause)
- Exposure to radiation
- Taking adrenal cortical hormones for a long time
- Excessive exposure to sunlight
- Birth defect
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