In<unk> , vision is missing in the outer (temporal or lateral) half of both the right and left visual fields. Information from the temporal visual field falls on the nasal (medial) retina. The nasal retina is responsible for carrying the information along the optic nerve, and crosses to the other side at the optic chiasm. When there is compression at optic chiasm, the visual impulse from both nasal retina are affected, leading to inability to view the temporal, or peripheral, vision. This phenomenon is known as<unk> . Knowing the neurocircuitry of visual signal flow through the optic tract is very important in understanding<unk> .<unk>  most commonly occurs as a result of tumors located at the mid-optic chiasm. Since the adjacent structure is the pituitary gland, some common tumors causing compression are pituitary adenomas and craniopharyngiomas. Also, another relatively common neoplastic cause is meningiomas. A cause of vascular origin is an aneurysm of the anterior communicating artery which arise superior to the chiasm, enlarge, and compress it from above.
Bitemporal hemianopsia
Homonymous hemianopsia
Binasal hemianopsia
Cerebral polyopia
Spatial hearing loss
Hemianopsia
Binocular dysphoria
Palinopsia