Explanation:

- The size of the pupil is controlled by the iris.

- Iris: This is the colored part of the eye surrounding the pupil. It expands or contracts to adjust the size of the pupil, regulating how much light enters the eye.

- Blind Spot:

- This is the point on the retina where the optic nerve leaves the eye; it's a spot with no photoreceptors, so it can't detect light.

- Retina:

- This is the layer at the back of the eye that contains cells sensitive to light; it converts light into neural signals for the brain.

- Cornea:

- This is the eye's outermost layer. It protects the eye and helps focus light onto the retina.