Abstract
Increasing use of visual tests in the field of personnel selection, 1 special military needs and the rapid expansion of aviation have stimulated interest in technics which measure stereopsis. For several years the Howard-Dolman test of stereopsis 2 (not to be confused with the original Howard test 3 ) has been used extensively, and more recently Verhoeff 4 has described another method. Verhoeff's test evaluates the acuity of stereopsis by means of a simple device which causes the estimate of relative depth to be based on binocular parallax, eliminates eye-hand coordination and difference in image size as aids in forming judgments and permits little opportunity (1 chance in 65,000) for passing the test by guessing. 4 The results obtained when a group of adolescents was given both these tests are discussed in this report. METHOD The entire student population of a boys' preparatory school was given a thorough ophthalmic examination, 5
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