Optic disc

n. (Anatomy) optic disk, point where the optic nerve joins the retina, area in the retina of the eye which is not sensitive to light

The optic disc or optic nerve head is the location where ganglion cell axons exit the eye to form the optic nerve. There are no light sensitive rods or cones to respond to a light stimulus at this point thus it is also known as "the blind spot" or "anatomical blind spot"; the break in the visual field created by the optic disc is also called "the blind spot" or "physiological blind spot". The optic nerve head in a normal human eye carries from 1 to 1.2 million neurons from the eye towards the brain.
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Optic disk n. The small, circular, optically insensitive region in the retina containing no rods or cones, where fibers of the optic nerve emerge [more]Optic disc - Community and Resources

Noun
1. the point where the optic nerve enters the retina; not sensitive to light
(synonym) blind spot, optic disk
(hypernym) point
(part-holonym) retina

the junction of all of the retinal nerve fibers at the beginning of the optic nerve. Appears as a grayish disc shape near the fovea in fundus photos.