Final answer:
The blind spot, or optic disc, is the area of the eye that lacks photoreceptors and is where the optic nerve exits, carrying visual information to the brain. Light cannot be perceived when focused on this area, but the brain compensates by filling in the missing information.
Step-by-step explanation:
The region of the eye where the optic nerve exits, and which lacks photoreceptors, is known as the blind spot or optic disc. The optic nerve is formed by the convergence of axons from the retinal ganglion cells. It carries visual information from the retina to the brain. The blind spot is characterized by the absence of photoreceptor cells, which means light focused on this area cannot be perceived. Instead, images are typically focused on the fovea of the retina, which has the highest density of photoreceptor cells known as cones, responsible for high resolution and color vision. The location and adaptive nature of our visual fields prevent us from being aware of our blind spots, as the brain fills in the missing information and each eye covers the blind spot of the other.