Joan Gewirtz, MD - Ophthalmologist

What is the optic nerve?

The optic nerve is a bundle of more than 1 million nerve fibers. It connects the retina to the brain. (See diagram below.) The retina is the light-sensitive tissue at the back of the eye. A healthy optic nerve is necessary for good vision.
Facts about Dry Eye
A cross-sectional diagram of the eye, showing the optic nerve at the back (left side of diagram).
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