A clinical pilot study comparing refractive error and Preferential Looking (PL) visual acuity in infants 2 to 12 months of age is described. The PL visual acuity of 30 infants was assessed using the "Acuity Card Procedure" PL technique developed by Teller and Dobson. Mohindra's dark room retinoscopy technique was used to determine refractive error. All infants of this sample had PL visual acuities within the norms established by McDonald and Dobson. Statistical analysis of the data for this sample of infants showed that refractive error does not change systematically from 2 to 12 months of age. We have found that the "Acuity Card Procedure" PL technique when utilized in a clinical setting agrees with infant visual acuity as described in the research literature. Refractive error did net correlate with changes in PL visual acuity in infants 2 to 12 months of age.
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