Question

an old person is unable to see clearly nearby object as well as distant objects.

(1) what defect of vision is he suffering from ?

(2) what kind of lense will be required to see clearly the nearby object as well as the distant objects.?

Answer 1

(a)it is called as presbyopia

(b)it can be corrected by bifocal lens
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Answer 2

According to the data mentioned in the question that,

An old person is unable to see clearly nearby object as well as distant objects.

1)The old man is suffering from a optical disease which is also known as the "presbyopia."

2)He have to use bifocal lenses or eyegalsses in order to clearly see the objects in both nearby and distance.