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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 general: 1  Damage to the optic nerve anterior to the optic chiasm causes loss of vision in the eye on the same side as the damage. 2  Damage at the optic chiasm typically causes loss of vision laterally in both visual fields (bitemporal hemianopsia). It may occur with large pituitary tumors pituitary adenoma.