Abstract
Recently, a study to evaluate the eyesight function by measuring the wave aberrations of lens has begun to improve the quality of vision. When the spectacle lens is fixed with the rim, lens strain occurs if the shape of contact surface dose not fit each other. In this study, the influences of the lens clamping of full-rim spectacle on the lens strain were discussed. Three kinds of plastic lenses which are different in the lens diopter with aspect ratio of 1.4 are retained to the same frame and these lens strain are evaluated by experiments and finite element analysis. As a result, we found that the strain of backside of lens was bigger than the face of the lens and the strain of myopia spectacle (-6D) was the biggest than myopia (-3D) and far sight (3D). Furthermore, we found that the equivalent strain of the lens eyes axis decrease dramatically when the Yagen angle of the lens backside of spectacle for myopia became bigger 2 degrees than the conventional angle.
