[1] Univ Sao Paulo, Inst Psychol, Visual Electrophysiol & Psychophys Sect, Sao Paulo, Brazil
[2] Univ Fed Sao Paulo, Dept Ophthalmol, Sao Paulo, Brazil
[3] Univ Sao Paulo, Sch Med, Univ Hosp, Div Neonatol, Sao Paulo, Brazil
[4] Assoc Assistance Handicapped Children, Sao Paulo, Brazil