Question

Explain defects of vision and its correction​

Answer 1

Answer:

There are mainly three common refractive defects of vision. These are

(i) myopia or near-sightedness

(ii) Hypermetropia or far – sightedness

(iii) Presbyopia. Myopia is also known as near-sightedness. A person with myopia can see nearby objects clearly but cannot see distant objects distinctly.

Answer 2

Explanation:

1) Myopia( concave lens)

2) Hyperopia (convex lens)

3) Astigmatism ( cylindrical lens)