Why can a normal person see distant as well as nearby objects clearly?

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Solution

Power of accommodation
The power of accommodation refers to the capacity of the eye's lens to adapt to the focal length.
The contraction and relaxation of the ciliary muscle help to change the focal length of the lens of the eye.
The normal person can see distant as well as nearby objects clearly because:
The focal length of the eye lens is adjusted automatically.
The lens becomes thin as the ciliary muscles relax. As a result, the focal length of the lens rises. This allows us to clearly perceive distant objects.
The curvature of the eye lens is increased, as the ciliary muscles contract, this reduces the focal length of the lens. This allows us to clearly view the nearby objects.
Due to this mechanism of eyes a normal person is able to see distant as well as nearby objects clearly.

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