Measurement of infant visual acuity from pattern reversal evoked potentials

Visually evoked potentials (VEP) were recorded from infants between the ages of 2 and 6 months using a pattern reversal checker-board stimulus. Measurement of the amplitude of the VEP as a function of check size showed a peak at 30′ of arc for 2, 3 and 4 month old infants and at 15′ of arc for 5 and 6 month old infants. Furthermore, extrapolation of a regression line from the peak VEP check size to zero μV to estimate VEP acuity showed that VEP acuity improves from 20/150 at 2 months to 20/20 by 6 months.