What part of the eye contains the photoreceptor cells?

The retina is the part of the eye that contains photoreceptor cells, which are essential for vision. These specialized cells, known as rods and cones, are responsible for converting light into electrical signals that are sent to the brain, allowing for visual perception. Rods are highly sensitive to light and enable vision in low-light conditions, while cones are responsible for color vision and function best in brighter light.

In contrast, the cornea is primarily responsible for focusing light as it enters the eye; the lens fine-tunes that focus to ensure clear vision; and the sclera provides structural support and protection to the eye. Therefore, the retina is uniquely designed to play a critical role in the processing of visual information, making it the correct answer to this question.