What part of the eye contains photoreceptor cells?

The retina is the part of the eye that contains photoreceptor cells, which are crucial for vision. These specialized cells, namely rods and cones, are responsible for converting light into electrical signals that the brain can interpret as visual images. Rods are sensitive to low light levels and are essential for night vision, while cones are responsible for color vision and function best in bright light conditions.

The iris, cornea, and sclera do not contain photoreceptor cells. The iris is the colored part of the eye that controls the size of the pupil and the amount of light entering the eye. The cornea is the transparent front part of the eye that helps focus light, and the sclera is the white outer layer that provides protection and structural support. Hence, the unique role of the retina in housing the photoreceptors is what makes it essential for the process of visual perception.