Question

In old age farsightedness is a defect of the eye in man, in which
(A)Eyeball becomes short
(B)Eyeball becomes elongated
(C)Lens become less elastic
(D)Lens become more spherical​

Answer 1

As the person becomes old, many of its body parts and tissues become old and lose their working efficiency, and then it’s the capability to move efficiently. This aging of tissue causes many problems for the individual.

Complete answer:
In old age farsightedness is a defect of the eye in man, in which the Lens become less elastic. This defect is known as Presbyopia. Presbyopia is a defect that is caused by a hardening of the lens of your eye, which occurs with aging. As your lens becomes less flexible, it can not change shape to specialize in close-up images. Due to this, these images appear out of focus.

Additional Information: Presbyopia is the gradual loss of your eyes' ability to specialize in nearby objects. It is a natural part of aging. Presbyopia usually becomes noticeable to an individual in their early to mid-40s and continues to worsen until around age 65.
Presbyopia develops gradually. you'll first notice these signs and symptoms after age 40:
A tendency to carry reading farther away to form the letters clearer
Blurred vision at normal reading distance or even eye strain or headaches after reading or doing close-up work is also often seen. No cure exists for presbyopia. However, there are several treatments available that can help us to correct our vision. counting on your condition and lifestyle, You can choose between corrective lenses, contact lenses, or surgery to correct your vision.
So, the correct answer is ‘Lens become less elastic’.

Note: Risk factors other than age which will cause or increase chances of Presbyopia are the increased uptake of the drugs and if individuals are suffering from some previous diseases like diabetes or cardiovascular diseases.