[1] Stanford Univ, Dept Ophthalmol, Palo Alto, CA 94304 USA
[2] Stanford Univ, Dept Neurol & Neurol Sci, Palo Alto, CA 94304 USA
[3] Indiana Univ Sch Med, Dept Neurol, Indianapolis, IN 46202 USA
[4] Indiana Univ Sch Med, Dept Neurosurg, Indianapolis, IN 46202 USA
[5] Richard L Roudebush Vet Adm Med Ctr, Ophthalmol Serv, Indianapolis, IN 46202 USA
[6] Midwest Eye Inst, Neuroophthalmol Sect, Carmel, IN USA