Question

The near point for a young adult with normal vision is
(A) 2.5 cm
(B) 25 cm
(C) 2.5 m
(D) 25 m

Answer 1

Hint
Near point is the closest point at which an object can be placed and can still form a focused image on the retina. We will check the given options according to the definition and mark the correct option

Complete step by step answer
We know that for seeing an object it should be held at 25 cm from the eyes. Also, the minimum distance at which objects can be seen without strain is called the least distance of distinct vision i.e. near the point of the eye.
For a young adult with normal vision the near point is about 25 cm. A normal eye can see objects that are in the range of 25 cm and infinity. So, the nearest point is 25 cm.
Hence the correct solution is option (B).

Additional Information
For a normal adult, normal vision is usually considered to be the vision with a near point of 25 cm and if it is more than that then appropriate prescription should be designed to correct the vision so that normal eyes could see it.

Note
One should not confuse the near point associated with the defects related to vision such as myopia and hypermetropia. Near points in such cases are different. Myopia is such a condition in which we can see near objects clearly and far objects are blurry and the near point in this case is more than cm. whereas on the other hand hypermetropia is a condition in which we can see the far objects clearly and near objects are blurry. So, the near point in this case is less than 25 cm.