Patients typically complain of sudden onset of painless visual loss in the affected eye, which is often noticed upon waking up in the morning. Classically, the upper or lower half of the visual field may be affected more severely.
If there are associated symptoms of jaw pain, headache over the temple area, scalp pain or weight loss, seek urgent treatment as giant cell arteritis may be the cause of visual loss.
Normal optic nerve head
Optic nerve head in a patient with NAION