PROBLEM TO BE SOLVED: To measure operating vision more accurately and comfortably by using a computer.SOLUTION: In this method and an apparatus for measuring the practical visual acuity, an optotype mark is displayed (step 103). A subject's response to the optotype mark is received by an input device (step 104). A determination is made as to whether or not the response is correct; when the current response of the subject is correct and the previous response or one of the previous response and the last-but-one response is incorrect, an optotype mark corresponding to the same visual acuity is determined to be presented; when the result shows that previous response is correct or both the previous response and the last-but-one response are correct, an optotype mark corresponding to a visual acuity one-level higher is determined to be presented, while when the current response of the subject is incorrect, an optotype mark corresponding to a visual acuity one-level lower is determined to be presented (steps 105-112).
METHOD FOR ANALYZING PRACTICAL VISUAL ACUITY