Question

There is large variation see in the values of least distance of distinct vision in case of children and old age people give reason​

Answer 1

Answer:

The least distance up to which we can see the objects clearly without any strain is called least distance of distinct vision. ... As a result, the power of accommodation reduces and hence the least distance of distinct vision for old people (55years) generally increases. This defect is called Presbyopia

Answer 2

Answer:

The distance of the near point of a normal eye is called the least distance of vision. ... For a normal eye, Value of least distance of distinct vision is d=25. This distance increases with age, because of decreasing effectiveness of the ciliary muscles and loss of flexibility of the eye lens.