Within the eyeball. Often used to describe visual phenomena generated by mechanical or electrical stimulations of the retina. [ento- + G. optikos, relating to vision]
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ent·op·tic (')ent-'äp-tik adj lying or originating within the eyeball used esp. of visual sensations due to the shadows of retinal blood vessels or of opaque particles in the vitreous body falling upon the retina
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en·top·tic (en-topґtik) [ent- + optic] denoting visual phenomena which have their seat within the eye.Medical dictionary. 2011.