Editing Visual system (section)

===Optic chiasm===
{{Main|Optic chiasm}}
The optic nerves from both eyes meet and cross at the optic chiasm,<ref>{{cite book |author=Turner, Howard R. |title=Science in medieval Islam: an illustrated introduction |chapter-url=https://archive.org/details/scienceinmedieva0000turn |chapter-url-access=registration |publisher=University of Texas Press |location=Austin |year=1997 |chapter=Optics |page=[https://archive.org/details/scienceinmedieva0000turn/page/197 197] |isbn=978-0-292-78149-8 |oclc=440896281 }}</ref><!--[http://www.stanford.edu/~kendric/DPC3/medieval_eye_files/medieval_eye.pdf Another link to al-Haytham's sketch of optic chiasm]--><ref>{{harvnb|Vesalius|1543}}</ref> at the base of the [[hypothalamus]] of the brain. At this point, the information coming from both eyes is combined and then splits according to the [[visual field]].  The corresponding halves of the field of view (right and left) are sent to the left and right [[Cerebral hemisphere|halves of the brain]], respectively, to be processed. That is, the right side of [[primary visual cortex]] deals with the left half of the ''field of view'' from both eyes, and similarly for the left brain.<ref name="nolte"/> A small region in the center of the field of view is processed redundantly by both halves of the brain.