Characteristics of near-point and far-point binocular and monocular sighting in classroom and ophthalmological populations.

Near-point and far-point binocular and monocular sighting tests given 240 high and low achievers from regular classrooms at Grades 4, 8, and 12 yielded significant differences by chi2 in distributions of near-point binocular sighting only. Twelfth-grade subjects were significantly different on this test from those in other grades. Classroom distributions for all other tests were not significantly different from those found in an ophthalmological population reported by Fink in 1938. The distributions of all tests were highly skewed and could not be considered normal. Comparisons of individual tests for total high and low achievers and all groups combined indicated that near-point and binocular tests appear to be independent of, and far-point and monocular tests appear to be related to, other sighting tests.