视神经 shìshénjīng optic nerve Origin Definitions Defs Strokes Stroke Words Sentences Sents 视神经乳头 shìshénjīngrǔtóu optic disc optic disc (terminal of the optic nerve on the retina)视神经盘 shìshénjīngpán optic disk optic disk (terminal of the optic nerve on the retina)