Age norms for monocular grating acuity measured by sweep-VEP in the first three years of age.
OBJECTIVE
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.
Salomão
Solange Rios
SR
Departamento de Oftalmologia, Universidade Federal de São Paulo, São Paulo, SP, Brasil. ssalomao@oftalmo.epm.br
Ejzenbaum
Fabio
F
Berezovsky
Adriana
A
Sacai
Paula Yuri
PY
Pereira
Josenilson Martins
JM
D002675:Child, Preschool; D005074:Evoked Potentials, Visual / Q000502:physiology*; D006801:Humans; D007223:Infant; D010364:Pattern Recognition, Visual / Q000502:physiology; D012016:Reference Values; D012684:Sensory Thresholds / Q000502:physiology; D014787:Vision Tests / Q000379:methods*; D015349:Vision, Monocular / Q000502:physiology*; D014792:Visual Acuity / Q000502:physiology*