In another report1 the results of examination of the eyes of 1,009 adolescents were described, and the number found, by each of a series of tests, to have visual defects was discussed. The testing of vision as part of an annual medical examination of adolescents is an important procedure and in the ideal situation would most effectively be carried out by a qualified ophthalmologist. Since such highly qualified members of the personnel are seldom available, one must usually rely on a screening device designed to select persons who would benefit by a more thorough examination. For such purposes the Massachusetts vision test2 has proved adequate ; this test has recently been approved by the National Committee on Optics and Visual Physiology and by the Council on Physical Therapy of the American Medical Association.3
However, there is a need, under certain conditions, for a visual test which furnishes quantitative