One of the most common vitamin<unk> es in developing countries
Most common cause of blindness in developing world
In US, most commonly found in conjunction with fat malabsorption syndromes (e.g. IBD, pancreatic insufficiency, celiac sprue, cystic fibrosis, laxative abuse)
Vitamin A deficiency
Painful
Vitamin E deficiency
Arteritic anterior ischemic optic neuropathy
Vitamin A toxicity
Optic neuritis
Vitamin B7 deficiency
Temporal arteritis†