Defects of Vision

Q.

What is presbyopia? State its causes and how is it corrected?

Q. Presbyopia is corrected using lenses.

1. concave
2. convex
3. bifocal

Q.

Myopia is due to

1. elongation of eyeball and the thicker lens

2. irregular change in focal length

3. shortening of eyeball

4. older age

Q.

In myopia

1. no image is formed

2. image is formed in front of retina

3. image is formed at retina

4. image is formed behind retina