[1] Virginia Commonwealth Univ, Biomed Engn Program, Richmond, VA USA
[2] Virginia Commonwealth Univ, Dept Neurol, Div Neuroophthalmol, Richmond, VA USA
[3] Virginia Commonwealth Univ, Dept Ophthalmol, Div Neuroophthalmol, Richmond, VA USA
[4] Virginia Commonwealth Univ, Med Coll Virginia, Div Neurosurg, Richmond, VA 23298 USA