Question

What is presbyopia? State the cause of presbyopia. How is presbyopia of a person corrected?

Answer 1

Step 1: Definition of presbyopia or old sight

The near point of the eye of a person gradually recedes away. They find it difficult to see nearby objects comfortably and distinctly without corrective eye-glasses. This defect is called presbyopia.

Step 2: Cause of presbyopia

As a person gets older, the ciliary muscles holding the eye lens weaken and the lens lose some of its elasticity. Therefore, the power of accommodation of the eye decreases with ageing.

Step 3: Correction of presbyopia

To correct this defect, the elderly people need to use spectacles with a convex lens. They need to wear these spectacles for reading or similar kind of close work.