Question

What is the range of vision for a normal healthy human eye?

Answer 1

1. Range of vision refers to the range of distance across which the eye can see clearly.
2. Objects lie between infinity and the shortest distance of distinct vision can be seen clearly by a normal human eye.
3. Thus, the range of vision of a normal healthy human eye is from infinity to the shortest distance of distinct vision, that is, from infinity to about $25cm$ from the eye.