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The crossing over of optic nerve fibres at the optic chiasm allows the visual cortex to receive the same hemispheric visual field from both eyes. Superimposing and processing these monocular visual signals allow the visual cortex to generate binocular and stereoscopic vision.
The optic nerve carries the impulses formed by the retina, the nerve layer that lines the back of the eye and senses light and creates impulses.These impulses are dispatched through the optic nerve to the brain, which interprets them as images.Using an ophthalmoscope, the head of the optic nerve can be easily seen.he lens is the transparent structure inside the eye that focuses light rays onto the retina. The retina is, as mentioned, the nerve layer that lines the back of the eye, senses light and creates impulses that go through the optic nerve to the brain.