Vitamin $A$ is necessary for the proper physiological function of the eye because

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:

Human eyes are most sensitive to green colour. Its wavelength is approximately:

An eye is said to be near-sighted when a

In hypermetropia,the image is formed

The space between the cornea and the lens is called .....