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anatomy area arthropods background ball blue body cells chordates ciliary circadian cornea cortex diagram diaphragm drawing entrainment eyeball eyes eyesight focuses ganglion graphic human iris isolated lens lenses light look macula microorganisms molluscs nerve neurons nuclei optic optical organ photosensitive pretectal pupil pupillary reflex retina retinohypothalamic rhythms science sclera sight sufficient suprachiasmatic tract vector vision visual vitreous white