A photoreceptor is a specialized cell in the eyes that detects light and converts it into electrical signals. These signals are then sent to the brain, allowing us to perceive images and colors. There are two main types of photoreceptors: rods, which are sensitive to low light levels and help with night vision, and cones, which function in brighter light and are responsible for color vision. Photoreceptors are crucial for vision in many animals, including humans. They are located in the retina, the light-sensitive layer at the back of the eye. Damage to photoreceptors can lead to vision problems or blindness, highlighting their importance in the visual system.