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Last Updated: March 26, 2020


The orbit is the complexly organized group of neural, vascular, muscular, ligamentous, and osseous structures that opens onto the face and external world to collect and provide binocular visual information to the brain. The retina, which captures visual information, is protected from external trauma, overexposure, and excessive light by the eyelids and a precisely organized mechanism for modulating light reaching the biological visual screen. The g...