Visual acuity in children as a function of hue

Ninety-six suburban school children, 7 to 14 years old, were tested, with colored parallel bars as acuity targets, to assess relative effects of hue, age, and intelligence on visual acuity. The main effects of color and age were found to be significant but with no significant interaction. A one-way analysis of variance for each color indicated blue and black acuity improved with age while red did not. Since natural myopia for blue light may have accounted for the effect with blue, a second experiment was undertaken with focusing being introduced as a variable. Focusing eliminated the effect of age, but the color effect remained significant. Lowest resolution thresholds were obtained with black, next red, and blue highest. There was no relationship between acuity and intelligence nor were there any sex differences.