Question

Name the defect of eye vision in which the focussing power of eye lens decreases with age.

Hint:

Presbyopia is a natural part of aging, but it can be managed effectively with corrective lenses or by wearing reading glasses.

Answer 1

The defect of eye vision in which the focusing power (the power of accommodation) of the eye lens decreases with age is called presbyopia. As a person ages, the eye lens gradually becomes harder and loses its elasticity. Simultaneously, the ciliary muscles that control the shape of the lens may weaken. This reduces the lens's ability to become sufficiently convex for focusing on close-up objects. As a result, the near point of the eye recedes, and people with presbyopia find it difficult to read or perform other close-up tasks without corrective lenses (like reading glasses or bifocals). This condition typically becomes noticeable after the age of 40.