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The beginning of the optic nerve in the retina is called the optic nerve head or optic disc. Since there are no photoreceptors (cones and rods) in the optic nerve head, this area of the retina cannot respond to light stimulation. As a result, it is known as the blind spot, and everybody has one in each eye.
The entire retina contains about 7 million cones and 75 to 150 million rods. The optic disc, a part of the retina sometimes called the blind spot because it lacks photoreceptors, is located at the optic papilla, a nasal zone where the optic-nerve fibres leave the eye. It appears as an oval white area of 3mmÂ². Temporal (in the direction of the temples) to this disc is the macula.