At the top, is a labeled schematic drawing of a sagittal section through an eyeball. The cornea is transparent. The pupil (arrow, bottom-left) is the opening surrounded by the iris. The chambers rostral to the lens contain aqueous humor. The chamber caudal to the lens contains a gelatinous vitreous body. The optic disc (arrow, bottom-right) is the site in the retina where optic nerve fibers exit the eyeball.

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