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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.
In the chiasma 45% of the nerve fibres from each eye cross over to the other side. The two nerve trunks which leave the optic chiasma carry respectively signals from the left of each eye to the left, and from the right of each eye to the right.