The pigment found in the rods of the eye is ....

In a newly born child,the eyes are:

Which of the following statements is correct regarding the pupil of the human eye?
$(I)$. It is the aperture surrounded by the iris.
$(II)$. The diameter of the pupil is regulated by the muscle fibres of the iris.
$(III)$. It is a transparent crystalline structure attached to the ciliary body.
The correct option is:

Cornea transplant in humans is almost never rejected. This is because

What is the function of ciliary muscles?

What happens if a source of bright light suddenly becomes bright in front of the eye?