Question

define cataract.
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Answer 1

I read about cataract in class 8 in light lesson.

Clouding of the normally clear lens of the eye is called cataract.

Most cataracts develop slowly over the course of years.

The main symptom is blurry vision. Having cataracts can be like looking through a cloudy window.

When a cataract interferes with someone's usual activities, the cloudy lens can be replaced with a clear, artificial lens. This is generally a safe, outpatient procedure.

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Answer 2

$\bf{Cataract}$- Sometimes, due to aging, there forms a cloudy layer over the surface of the crystalline eye lens. This leads to the blurred vision. It may also result in its extreme form that the person becomes blind.

This condition of blurred vision because of formation of cloudy layer over eye lens is called cataract.

It is an eye defect caused by age. Its only treatment is operation in which the old lens is taken out and a new one is inserted.

$\bf{Hope\: it\: helps:)}$