The retina is a thin layer of tissue located at the back of the eye. It contains millions of light-sensitive cells called photoreceptors, which convert light into electrical signals. These signals are then sent to the brain via the optic nerve, allowing us to perceive images. The retina plays a crucial role in vision, enabling us to see in various lighting conditions and perceive colors. It is divided into two main types of photoreceptors: rods, which are responsible for vision in low light, and cones, which detect color and detail in brighter light.