Optic chiasm

In anatomy, the optic chiasm is "the X-shaped structure formed by the meeting of the two optic nerves. At the optic chiasm the fibers from the medial part of each retina cross to project to the other side of the brain while the lateral retinal fibers continue on the same side. As a result each half of the brain receives information about the contralateral visual field from both eyes."

Scheme showing central connections of the optic nerves and optic tracts.