What is the function of the vitreous humor?

Which cranial nerve innervates the lateral rectus muscle of the eye?

Parts $A, B, C$ and $D$ of the human eye are shown in the diagram. Select the option which gives correct identification along with its functions/characteristics.

Which of the following is not correct for rods?
$(I)$. Twilight vision is the function of the rods
$(II)$. It is responsible for daylight vision sometimes
$(III)$. The rods contain a protein called rhodopsin
$(IV)$. Rods are photoreceptor cells
Choose the correct option

The muscles surrounding the pupil of a rabbit's eye are:

The defect of the eye that develops in old age is because: