A spherical lens means that one side of the lens is curved, while an aspherical lens is completely flat. Generally, the periphery of the aspherical lens will be thinner, and the imaging effect will be better, especially the peripheral image of the field of view will be less deformed. Especially at night, the scattering of this light will be better, which is more suitable for people who often drive vehicles. And the improvement of visual effect will also make patients feel better when they work and live in various environments. Therefore, aspherical lenses are generally more expensive than spherical lenses, but they can bring clearer visual effects, especially for peripheral objects.
However, it is not necessary to use an aspherical lens, and it can be judged according to its own economic situation and its own degree. For patients with higher powers, the visual improvement obtained by choosing aspheric lenses will be better than spherical lenses; but if only low myopia, such as 100 degrees, the difference between the two lenses may be small.
When matching glasses, the staff of the optical shop will tell you whether the lenses are spherical or aspherical. Compared with spherical lenses, aspherical lenses are better than spherical lenses. First, aspherical lenses with high myopia are thinner; secondly, from the perspective of physical optics , Aspherical lens can reduce the aberration of optical correction lens, reduce lens magnification, and see things more clearly with glasses.
The refractive power of spherical lenses is different from that of aspherical lenses. In addition, the unevenness of the mirror surface is also different, and its performance is also different. Usually pay attention to eye hygiene and avoid looking at things at close range. When looking at things for a long time, it will cause eye soreness, sore eyes will also occur, eyes will feel tired, and symptoms of myopia will appear.