Question

A person can comfortably read a book but finds it difficult to read the number on a bus parked 5 m away from him. Name the type of defect of vision he is suffering from. Which type of lens should be used in his spectacles to correct his vision?

Answer 1

Answer:

The person is defected from Hyperopia and he should wear convex lens spectacles.

Answer 2

Myopia or nearsightedness

Explanation:

The person can read a book that is closer clearly, but is not able to read the bus number located a bit far off. So he must be suffering from myopia, also known as nearsightedness. He cannot see distant objects clearly because the lens in his eye lacks the power to converge the rays from distant objects on his retina. The rays tend to converge at a point outside the retina and hence the difficulty in his vision. An external concave lens is used to focus the rays on the retina, thus correcting the problem.