Question

what is cataract how it is corrected​

Answer 1

cataract: the medical condition in which the lens of the eye of a person becomes cloudy resulting in Blurred vision is known as cataract.
it is corrected by any type of spectacle lenses.

Answer 2

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A medical condition in which the lens of the eye of a person becomes progressively cloudy resulting in blurred vision is called cataract

☯ Vision of the person can be restored after getting surgery done on the eye having cataract. The opaque lens is removed from the eye of the person by surgical operation and a new artificial lens is inserted in its place.

Note that

The eye-defect called ‘cataract’ cannot be corrected by any type of spectacle lenses.