The optic chiasm is an X-shaped structure formed by the crossing of the optic nerves in the brain. The optic nerve connects the brain to the eye. To biologists, the optic chiasm is thought to be a ...

which can compress the optic chiasm, leading to bitemporal hemianopsia (loss of vision in the outer half of both eyes).” Brain tumors in the temporal or occipital lobes can cause visual ...