NCIt definition : The part of the central nervous system that contains the organs and connections that
allow for the processing of visual images as well as some non-image forming visual
functions, including circadian photoentrainment. Structures comprising the visual
system include the eye, the optic nerve, the optic chiasma, the optic tract, the lateral
geniculate nucleus, the optic radiations, the visual cortex, and the visual association
cortex.;