Optic nerve atrophy (ONA) is a permanent visual condition caused by damage to the optic nerve. The optic nerve carries images of what we see from the eye to the brain. When there is damage to the optic nerve, central vision may be blurred and dimmed. Other visual problems include decreased visual field, color vision deficits and a diminished pupil light reflex. The most common cause is poor blood flow, called ischemic optic neuropathy, which most often affects elderly people. The optic nerve can also be damaged by glaucoma and other eye diseases as well as by stroke, other neurological conditions and outside trauma. Damage from optic nerve atrophy cannot be reversed. However, if caused by an underlying disease that can be treated, it is possible to prevent further vision loss.

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