Perception of colour is possible among

In old age,the vision of the eye becomes dim. It is due to

If a bright light falls over the eyes,why is a person unable to see for a moment?

The human eye is sensitive only to light having a wavelength ranging from

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:

The space of the vitreous chamber is located .........