Question

Fill in the blanks:

An aged person suffering from __________, caused by the weak accommodation power of the eye lens associated with old age, should wear _________ lenses.

• A. Hypermetropia, convex
• B. Astigmastism, cylindrical
• C. Presbyopia, bifocal
• D. Myopia, concave

Answer 1

Answer: (C)

Correct answer (a)

The power of accommodation of the eye usually decreases with ageing. For most people, the near point gradually recedes away. They find it difficult to see nearby objects comfortably and distinctly without corrective eye-glasses. This defect is called Presbyopia. It arises due to the gradual weakening of the ciliary muscles and diminishing flexibility of the eye lens.

Sometimes, a person may suffer from both myopia and hypermetropia. Such people often require bi-focal lenses. The upper portion consists of a concave lens. It facilitates distant vision. The lower part is a convex lens. It facilitates near vision.