What structures in the eye contain photoreceptors?

The retina is the primary structure in the eye that contains photoreceptors. Photoreceptors are specialized cells that convert light into electrical signals, which are then processed by the brain to form visual images. There are two types of photoreceptors in the retina: rods, which are responsible for vision in low light conditions, and cones, which are responsible for color vision and detail in brighter light conditions. The distribution of these photoreceptors within the retinal layers plays a crucial role in how we perceive our visual environment.

The other structures mentioned do not contain photoreceptors. The cornea, while important for focusing light, does not have photoreceptors; instead, it is a transparent layer that allows light to enter the eye. The lens is responsible for focusing the light onto the retina but similarly lacks photoreceptor cells. The pupil regulates the amount of light entering the eye but does not contain any photoreceptors either. Therefore, the retina stands out as the critical structure for light detection in the eye.