Homocysteinemia as a cause for amaurosis fugax in a patient without an apparent embolic source.

Purpose: To report a case with monocular transient vision loss (TVL) associated with Hyperhomocysteinemia. Methods: We present a case with persistent TVL attacks and high level of homocysteine. Results: A 32-year-old male had a history of episodes of recurrent monocular TVL. Extensive ophthalmic, systemic and laboratory studies were unremarkable with the exception of high plasma homocysteine level. He never experienced TVL during the 36-month follow-up after starting folate, B12 and B6 except for one episode in which he had discontinued the treatment for three months. Conclusion: This case may suggest hyperhomocysteinemia as one of the underlying causes of recurrent attacks of TVL without any known source of emboli.