Q1. A bifocal lens is used to correct the defect of: Choose the most appropriate option from below.
A Myopia
B Presbyopia Correct
C Cataract
D Hypermetropia
Explanation
A bifocal lens has two optical powers in the same lens, usually one part for distant vision and another for near vision. This arrangement is used for presbyopia, an age-related condition in which the eye gradually loses its ability to focus on nearby objects. Myopia needs a concave lens for distant objects, while hypermetropia is corrected with a convex lens for near vision. Cataract is clouding of the eye lens and is treated medically or surgically, not corrected by a bifocal lens as the primary remedy.