How to judge aspherical lenses

How to judge aspherical lenses

The surface curvature of aspherical lenses is different from that of ordinary spherical lenses, and in order to pursue the thinness of the lenses, it is necessary to change the curved surface of the lenses. The aspherical lens adopts an inner curved parabolic design, so that the power of the center of the lens and the periphery is close to the same, and the aberration of the edge of the lens is eliminated to a large extent, and the visual distortion is small. The wearer's vision is wider, clearer and more realistic. The aspherical design makes the lens have a small curvature and thin edges, which is more aesthetically pleasing. How to judge aspherical lens Method 1: Use focimeter to identify Compared with the edge power of the spherical lens, the top power of the negative film is less than the edge power; The top power of the positive film is less than or close to the edge power. Compared to the edge power of aspherical lenses, the top power of aspherical lenses is lower as they are closer to the edge, and the power of the cylindrical lens is higher closer to the edge. Method 2: Use the lens gauge to identify the bending degree of the spherical lens surface, while the curvature of the aspherical lens surface varies from part to part. It is easy to identify by the measurement results of the mirror meter. Method 3: Naked eye observation Compared with aspheric surfaces, aspherical lenses of the same material and the same power are flatter, thinner, more realistic, and more natural and comfortable. The above is "the method of judging aspherical lenses", compared to everyone has a certain understanding of aspherical lenses, if you have any questions in buying or wearing, you can consult our customer service online.