title: Visual acuity and its meridional variations in children aged 7-60 months.
abstract: A new operant procedure was used to assess grating acuity in children aged 7-60 months. The procedure was successful for 95% of the children sampled and had high test-retest reliability. Visual acuity for main axis (horizontal and vertical) gratings improved from 6/15 at 12 months to 6/6 at 60 months. For the 7-16 month age group, preferential-looking estimates of acuity agreed well with operant estimates. Acuity for oblique gratings was approximately 1/4 octave lower than main axis acuity throughout the age range. The results suggest that the human visual system continues to develop throughout the first 5 years of life.
mesh_terms: D000328:Adult; D000375:Aging; D002675:Child, Preschool; D003216:Conditioning, Operant; D006801:Humans; D007223:Infant; D008875:Middle Aged; D010364:Pattern Recognition, Visual / Q000502:physiology; D012399:Rotation; D014792:Visual Acuity