This article was medically reviewed by Theodore Leng, MD. Dr. Leng is a board certified Ophthalmologist and Vitreoretinal Surgeon and an Assistant Professor of Ophthalmology at Stanford University. He completed his MD and Vitreoretinal Surgical Fellowship at Stanford University in 2010. Dr. Leng is a Fellow of the American Academy of Ophthalmology and the American College of Surgeons. He is also a