作者：Giese, William James
摘要：In this study, a multiple-choice checker test was used to test visual acuity of 400 subjects in an age range of 17-36 yrs. The subjects were required to locate a checkered test square by indicating its position relative to 4 other control squares. The apparatus was set up so that 8 levels of visual acuity could be obtained at distances of .20, .25, .33, .40, .50, 1.00, 5.00, and 10.00 meters. Illumination in the vicinity of the apparatus was under 1 foot candle, and on the target it was 8 foot...
