Blind Spot.

Also known as the optic disc, oroptic papilla. It marks the entrance of theoptic nerve on the retina. Not sensitive to light

Source: Ophthalmic Dictionary including pronunciation, derivation and definition of the words used in Optometry and Ophthalmology by James J. Lewis, Oph. D. Professor of Optometry in the Northern Illinois College of Ophthalmology and Otology, Chicago.