Optometry and Vision Science · 1997 · 42 citations · 0 references
MedicineNeurosciencePediatricsChild DevelopmentVisual DevelopmentVisual PerceptionInfant Vision AssessmentPediatric Visual DevelopmentPerceptual DevelopmentVision AssessmentVisual AcuityVisual Evoked PotentialsAcuity MeasurementAge-related Electrophysiologic DevelopmentAmplitude ResponseDevelopmental Visual AcuityDevelopmental Visual MaturationTeller Acuity CardsTime-locked Brain ResponsesVisually Evoked Potentials
PURPOSE: This study compares the development of acuity in the same infants during one testing session using Teller acuity cards (TAC) and sweep visual evoked potentials (sVEP). We asked whether different testing methods in two centers would produce different developmental time courses. METHODS: Forty-eight infants were tested in two centers. The standard procedure for TAC was used. For sVEP acuity, the amplitude response curve derived from time-locked cortical activity was used to extrapolate to zero response, giving an acuity estimate for each infant. RESULTS: sVEP acuity was generally higher than TAC acuity. The rate of development was steeper for TAC than sVEP acuity with TAC starting at a much lower level. The ratio of sVEP to TAC acuity decreased exponentially with age reaching an asymptote of about 1.44 at 6 months. CONCLUSIONS: Results were indistinguishable between centers suggesting that comparison of acuity measures obtained using variations of these methods across centers is possible.