IDENTIFICATION METHOD OF EYE STRAIN AND ITS UTILIZATION

PROBLEM TO BE SOLVED: To provide a means which is useful for improvements in eye strain and the skin surrounding eyes. SOLUTION: An examinee is stayed firm at a fixed position and kept staired at a target set ahead of the examinee and the target is moved longitudinally ahead of the examinee to set the position of making the mark on the target begin to come out of focus as an indicator. The larger the focal length, the degree of eye stain is judged to be higher thereby discriminating the degree of the eye strain. As regards the tension of the muscle linked to the adjustment of eyes such as ciliary muscle, the larger the focal length, the degree of tension of the muscle is judged to be higher. As regards the state of the blood steam surrounding the eyes, using the indicator, the larger the focal length, the state of the blood stream is judged to be worse, thereby identifying the state of the blood stream surrounding the eyes. COPYRIGHT: (C)2008,JPO&INPIT