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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.
Physiological blind spots are an anatomical fact. There are no receptors (rods and cones) where the optic nerve pierces the retina. The field of vision that falls on the physiologic blind spots is not received by the retinal receptors (no receptors in the optic disc-blind spot) and therefore not perceived by the cortex. Since we are binocular beings, the field of vision that falls on the blind spot of one eye is visualized by the contralateral eye.