The retina is the light-sensitive lining at the back of the eye. It is composed of several layers of cells, including photoreceptors (rods and cones) and ganglion cells. When light enters the eye, it must pass through the layers of ganglion cells and other neurons before reaching the photoreceptors, which are located at the very back of the retina. The photoreceptors convert light into neural signals. A central area of the retina called the fovea is densely packed with cones and is responsible for sharp, detailed vision.