Ocular Disc

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The optic disc (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. This causes a break in the visual field called "the blind spot" or the "physiological blind spot".

The optic disc represents the beginning of the optic nerve (second cranial nerve) and is the point where the axons of retinal ganglion cells come together. The optic disc is also the entry point for the major blood vessels that supply the retina.

There are many different types of disorders that can affect the optic nerve, including:

Coloboma of optic nerve.

Glaucoma.

Idiopathic intracranial hypertension.

Neuromyelitis optica.

Optic nerve atrophy.

Optic nerve drusen.

Optic nerve pit.

Optic neuritis.