The average optic nerve is 1500 microns (or 1.5 millimeters) in size where it enters into the back of the eye. As it leaves the eye, the nerve size increases and varies in size until it intersects with the fellow eye’s optic nerve at the optic chiasm. Optic nerve size can vary in individuals.Click to see full answer. Moreover, is a large optic nerve normal?The cupping of the optic nerve means the size of the depression in the middle of the nerve when viewed from the front of the eye. When a person is shown to have large optic nerve cups, it could be an indicator of damage unless it can be determined that the cup size is considered normal for that individual.Beside above, what does it mean if one optic nerve is bigger than the other? Asymmetric discs Occasionally patients look like they have a bigger nerve head at the back of one eye compared with the other. This can give the impression that the larger nerve head has fewer nerve fibres than the smaller one, but again this is normal for each eye. People also ask, what is a normal cup to disc ratio? The normal cup-to-disc ratio is less than 0.5. A large cup-to-disc ratio may imply glaucoma or other pathology. However, cupping by itself is not indicative of glaucoma.What does a normal optic nerve look like?A normal optic nerve head (ONH) usually is round or oval, mildly elevated and pink in color, with a centralized depression known as the cup. The horizontal diameter of a typical optic nerve is approximately 1.5mm. 1. Melanocytoma with adjacent choroidal, retinal components and mild yellow exudation.