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A 22-year-old man presents with progressive decreased vision in both eyes for the past two years.  His visual acuity is 20/400 OU and he denies any prior eye surgery or disease.  His fundus and subsequent fluoroscein angiograms reveals the above clinical picture.

This disease is most likely caused by:

a. trauma b. infection c. vascular abnormality d.  genetic defect

For answers to the above, click here on or after July 26, 2005.