________  is an aperture which controls light passage in the eye.

Key Points

• The pupil is an aperture in the eye that controls the passage of light.
• Located in the center of the iris, the pupil can adjust its size to regulate the amount of light that enters the eye.
• This adjustment is essential for optimal vision, allowing more light in low-light conditions and reducing light intake in bright conditions.
• The size of the pupil is controlled by the iris muscles, which contract or dilate based on the lighting environment.

Additional Information

• The iris is the colored part of the eye surrounding the pupil and helps control the size of the pupil.
• The sclerotic coat, also known as the sclera, is the white outer layer of the eye that provides protection and structure.
• The blind spot is an area on the retina without photoreceptors, where the optic nerve exits the eye, rendering it insensitive to light.
• Proper functioning of the pupil is crucial for maintaining clear vision and protecting the retina from excessive light exposure.