The optic tract is a part of the visual system in the brain.

It is a continuation of the optic nerve and runs from the optic chiasm (where half of the information from each eye crosses sides, and half stays on the same side) to the lateral geniculate nucleus.

Right vs. left

The relationships of the retinal fibers to the optic tracts are as follows:

optic tract	temporal retinal fibers	nasal retinal fiber
right optic tract	from the right eye	from the left eye
left optic tract	from the left eye	from the right eye

Pathology

A lesion in the left optic tract will cause right-sided homonomous hemianopsia.

Additional images