[1] Emory Univ, Dept Ophthalmol, Sch Med, Atlanta, GA USA
[2] Emory Univ, Dept Neurol, Sch Med, Atlanta, GA USA
[3] Univ Nebraska Omaha, Coll Informat Sci & Technol, Dept Informat Syst & Quantitat Anal, Omaha, NE USA
[4] Neuroophthalmol Serv, Dept Ophthalmol, 1365B Clifton Rd NE, Atlanta, GA 30322 USA