Optic Disk

The optic disk (or optic nerve head) is the part of the rear of the eye where the bundle of ganglion cell axons exit the eye to form the optic nerve. It is also the point at which major blood vessels enter the eye to supply the retina. Because this small point of the eye does not contain rods or cones it constitutes a physiological blind spot. Opthamologists consider the optic disk is a sort of "bellwether" that can be used as an indicator of many other optical problems (related to intracranial pressure) such as glaucoma, optic neuritis, anterior ischemic optic neuropathy, papillodema and optic disk drusen.