Age norms for monocular grating acuity measured by sweep-VEP in the first three years of age

• Autor(a) principal: Salomão, Solange Rios [UNIFESP]
• Data de Publicação: 2008
• Outros Autores: Ejzenbaum, Fábio [UNIFESP], Berezovsky, Adriana [UNIFESP], Sacai, Paula Yuri [UNIFESP], Pereira, Josenilson Martins [UNIFESP]
• Tipo de documento: Artigo
• Idioma: eng
• Título da fonte: Repositório Institucional da UNIFESP
• Texto Completo: http://dx.doi.org/10.1590/S0004-27492008000400002; http://repositorio.unifesp.br/handle/11600/4506
• topic: Evoked potentials, visual; Visual acuity; Vision tests; Predictive value of tests; Reference values; Potenciais evocados visuais; Acuidade visual; Testes visuais; Valor preditivo dos testes; Valores de referência

PURPOSE: To determine age norms for grating visual acuity and interocular acuity differences measured by the sweep-visually evoked potentials (VEP) technique in the first three years of life. METHODS: Monocular grating visual acuity was measured using the sweep-VEP in 67 healthy normal infants and children in the first 36 months of life. RESULTS: Sweep-VEP grating acuity ranged from 0.80 logMAR (20/125 Snellen equivalent) in the first month of life to 0.06 logMAR (20/20 Snellen equivalent) at 36 months of age. Lower normal limits (95th percentile limit) ranged from 0.95 logMAR (20/180) to 0.12 logMAR (20/25) with a progression of approximately 3 octaves in the first 36 months of age. The largest acceptable interocular acuity difference for clinical purposes was 0.10 logMAR. CONCLUSIONS: Age norms for grating acuity along with interocular acuity differences were determined using the sweep-VEP technique. These norms should be incorporated in clinical practice for precise diagnosis of visual status in infants and preverbal children.