Final answer:
Photoreceptors are located at the back of the retina for several reasons. The fovea, located at the center of the retina, lacks supporting structures and has the highest visual acuity. Convergence of photoreceptors towards the edges of the retina reduces visual accuracy.
Step-by-step explanation:
Photoreceptors, which include rods and cones, are located at the back of the retina for several reasons. Firstly, the other layers of the retina, such as the axons, retinal ganglion cells, and bipolar cells, absorb a significant amount of light before it reaches the photoreceptors. However, the fovea, which is located at the center of the retina, lacks these supporting structures and only contains photoreceptors, resulting in the highest visual acuity. Additionally, the convergence of multiple photoreceptors onto a single retinal ganglion cell towards the edges of the retina reduces the accuracy of visual transduction.