The eye defect $Astigmatism$ can be corrected by using:

The choroid layer is thin over the $.......$ of the eyeball.

The colour of the eye is due to the pigmentation in:

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 black pigment in the eye which reduces internal reflection is located in:

In humans,corneal transplants are rarely rejected. This is because: