ABSTRACT We examined 310 schoolchildren to determine what normal values might be expected for successive convergence and divergence ocular movements. Vergence facility may affect the efficiency of visual information processing. The population consisted of children in grades 1 through 8. The subjects wore anaglyph glasses and viewed a nonvariable D‐x‐O anaglyph target alternately through a 16A base‐out and 4A base‐in prism flipper. The subjects were directed to keep the target “clear and single.” The total number of vergence cycles was recorded for 1 min. Students in higher grade levels were able to complete more vergence changes than students in beginning grades. The average number of changes accomplished per minute at each age level is presented for this population.
ANDREW R. BUZZELLI (Thu,) studied this question.