Question

List three common refractive defects of vision. Suggest the way of correcting these defects.

Answer 1

The three common refractive defects of vision are as follows:-

Myopia (short-sightedness):- It is corrected by using spectacles having concave lenses of appropriate power.

Hypermetropia (far-sightedness):- It is corrected by using spectacles having convex lenses of appropriate power.

Presbyopia:- This defect is corrected using bifocal lenses of appropriate power in which the upper part consists of a concave lens (to correct myopia) and the lower part consists of a convex lens (to correct hypermetropia).