Which structure in the eye contains photoreceptors?

The retina is the structure in the eye that contains photoreceptors, specifically rods and cones. Rods are responsible for vision in low-light conditions and peripheral vision, while cones function in well-lit conditions and are essential for color vision. The arrangement of these photoreceptors allows the retina to detect light and convert it into neural signals, which are then sent to the brain for processing visual information.

The other structures, while vital to the overall function of the eye, do not contain photoreceptors. The cornea, for instance, is primarily responsible for focusing light onto the retina. The lens further refines this focus, adjusting for distance and clarity. The sclera is the outer protective layer of the eye, which maintains its shape and provides a point of attachment for eye muscles. None of these elements contain cells that detect light, making the retina the unique and essential part of the visual system housing photoreceptors.