Visual development in healthy eyes from 24 months to four years of age.

The study is of visual development from 24 months to 4 years of age. The O-test was used in children from 24 to 27 months of age; and the Kolt-test from 28 months to 4 years. One measurement was performed in both eyes of 89 normal children aged from 24 months to 4 years. The mean visual acuity was 0.48 at 24 to 29 months; 0.55 at 30 to 35 months; 0.67 at 36 to 41 months; 0.77 at 3 1/2 to 4 years of age.