Explain the cataract in the eye.

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A cataract is a clouding of the eye's natural lens, which lies behind the iris and the pupil.
Cataracts are the most common cause of vision loss in people over age 40 and is the principal cause of blindness in the world
Causes of Cataracts:
1. The lens inside the eye works much like a camera lens, focusing light onto the retina for clear vision.
2. It also adjusts the eye's focus, letting us see things clearly both up close and far away.
3. The lens is mostly made of water and protein.
4. The protein is arranged in a precise way that keeps the lens clear and lets light pass through it.
5. But as we age, some of the protein may clump together and start to cloud a small area of the lens.
6. This is a cataract, and over time, it may grow larger and cloud more of the lens, making it harder to see.
Cataract risk factors include:
a. Ultraviolet radiation from sunlight and other sources
b. Diabetes
c. Hypertension
d. Obesity
Symptoms and Signs:
1. A cataract starts out small and at first has little effect on your vision.
2. Your vision is blurred a little, like looking through a cloudy piece of glass or viewing an impressionist painting.

Cataract is an opacity (cloud formation) of the eye lens, develops due to aging.

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