Human Eye Anatomy and Function Quiz

The Eye's Structure and Function

• The lens in the eye changes shape to focus light on the retina, allowing us to see objects clearly at varying distances.
• Ciliary muscles contract and relax to alter the lens's curvature, enabling the eye to focus on near or far objects.

Retina's Location

• The retina is located at the back of the eye, lining the innermost layer of the eyeball.

Light Signal to the Brain

• Light enters the eye through the cornea, passes through the lens, and hits the retina, where it stimulates photoreceptors (rods and cones).
• The stimulated photoreceptors send electrical signals through the optic nerve to the brain, where they are interpreted as visual information.

The Pupil's Function

• The pupil, a hole in the center of the iris, regulates the amount of light entering the eye by adjusting its diameter.
• In bright light, the pupil constricts to reduce light entrance, and in dim light, it dilates to allow more light in.