The region of the vertebrate eye, where the optic nerve passes out of the retina, is called the

The area of the retina that is most sensitive to light is the:

The figure shows parts of the human eye labeled as $A, B, C$ and $D$. Select the option which correctly identifies the labeled part with its function and characteristics.

Visual purple,also known as rhodopsin,is a pigment concerned with:

When the object is at a distance of more than $6 \text{ metres}$,at that time

Differentiate between the yellow spot and the blind spot.