From the *Masscahusetts Eye and Ear Infirmary, Harvard Medical School, Boston MA; and †The Eye Research Foundation, Birmingham, AL. Received for publication June 11, 2010; accepted September 15, 2010. Reprints: Claes H. Dohlman, Massachusetts Eye and Eye Infirmary, 243 Charles Street, Boston, MA 02114 (e-mail: [email protected]).