optic disc(redirected from porus opticus)
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(Anatomy) a small oval-shaped area on the retina marking the site of entrance into the eyeball of the optic nerve. See blind spot1
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|Noun||1.||optic disc - the point where the optic nerve enters the retina; not sensitive to light|
retina - the innermost light-sensitive membrane covering the back wall of the eyeball; it is continuous with the optic nerve
point - the precise location of something; a spatially limited location; "she walked to a point where she could survey the whole street"