Currently accepted criteria for diagnosis of<unk>  include: * Presence of diabetes mellitus (Appr. 70% type 1, 30% type 2) * Optic disc edema (unilateral in 60% cases) * Only mild optic nerve dysfunction Disc edema is diagnosed by fundus examination using ophthalmoscopy or fundus photography. Fundus examination often reveals dilated telangiectatic vessels over the disc also. Differential diagnosis<unk>  has many characteristics similar to Non-arteritic anterior ischemic optic neuropathy (NAION).<unk>  is simultaneously bilateral and unlike AION, optic nerve function is not impaired in<unk> . These are the two main clinical features that differentiate<unk>  from anterior ischemic optic neuropathy.
Diabetic papillopathy
Optic papillitis
Toxic and nutritional optic neuropathy
Vestibular papillomatosis
Retinal migraine
Arteritic anterior ischemic optic neuropathy
Autoimmune optic neuropathy
Primary juvenile glaucoma