Explain how a normal human eye is able to see distinctly objects placed at a distance as well as those placed at a nearer distance. What is the far point and near point of a normal human eye?

(N/A) normal human eye can adjust its focal length using the ciliary muscles, a process known as accommodation.
To see distant objects, the ciliary muscles relax, making the eye lens thin and increasing its focal length.
To see near objects, the ciliary muscles contract, making the eye lens thick and decreasing its focal length.
The far point of a normal human eye is at infinity $(\infty)$.
The near point of a normal human eye is at $25\, cm$ from the eye.