Funding/Support: This study was supported by the Retina Research Foundation of the Retina Society in Cape Town, South Africa (C.L.S.), the Noel T. and Sara L. Simmonds Endowment for Ophthalmic Pathology, Wills Eye Hospital, Philadelphia, Pa (R.C.E.), the Paul Kayser International Award of Merit in Retina Research, Houston, Tex (J.A.S.), a donation from Michael, Bruce, and Ellen Ratner, New York, NY (C.L.S. and J.A.S.), Mellon Charitable Giving from the Martha W. Rogers Charitable Trust, Philadelphia (C.L.S.), the LuEsther T. Mertz Retina Research Foundation, New York (C.L.S.), and the Eye Tumor Research Foundation, Philadelphia (C.L.S. and J.A.S.).