The defect of vision which cannot be corrected by using spectacles is:(a) myopia (b) presbyopia (c) cataract (d) hypermetropia

(c) cataract

Explanation

Cataract is a defect of the eye in which the eye-lens of a person become progressively cloudy or opaque resulting in blurred vision.

It usually comes in old age and develops due to the formation of a membrane (clumps of protein) over the eye-lens.

It can't be corrected by any type of spectacles lenses, rather it can be corrected by the surgery in which the opaque lens is removed, and a new artificial lens is inserted in its place.