NAION typically presents suddenly upon awakening. The afflicted person notes seeing poorly in one eye. Vision in that eye is obscured by a dark shadow, often involving just the upper or lower half of vision, usually the area closer to the nose. There is no pain. Within approximately six months following the infarct, visual acuity improves by three or more lines of vision on the Snellen Chart (the chart with smaller letters on each lower line) in 42.7% of patients, while in 12.4% of patients, vision worsens by three lines. Opposite eye involvement occurs in approximately 15% to 20% of patients with NAION within 5 years. It is not always devastating as visual acuity may remain only moderately impaired. Furthermore, most cases of NAION involve the loss of a hemifield (either the upper or lower half of the visual field, but not both). A few cases of NAION involve near-total loss of vision.
Anterior ischemic optic neuropathy
Posterior ischemic optic neuropathy
Ischemic optic neuropathy
Optic neuritis
Arteritic anterior ischemic optic neuropathy
Ocular ischemic syndrome
Infiltrative ophthalmopathy
Optic neuropathy