Sell CR 39 aspheric design hard resin optical lens

详情

Aspheric lenses Aspheric design. More thin, more flat, more clear and aesthetic! Aspheric lenses are lenses whose surface angles and profiles are neither part of a sphere nor part of a cylinder. Conventional or non-aspheric lenses have the same curve across their entire surface, like a ping-pong ball. Aspheric lenses accomplish the same amount of refraction but are flatter and slimmer. One of the most common uses of aspheric lenses is in vision correction. When used in eyeglasses, they are much thinner and lighter than traditional lenses. This gives a more pleasing aesthetic appearance, which is a matter of at least some concern to most eyeglass wearers. Aspheric lenses do not provide conclusively better performance than traditional lenses, but nor is there any compromise in quality of vision. Unlike photographic lens systems, aspheric eyeglass lenses are more expensive to produce than conventional types. The comparatively flat profile of aspheric lenses is especially noticeable when the lenses correct for severe hyperopia, or farsightedness. Ordinary lenses are much thicker and bulge out in the middle, sometimes causing an awkward magnification of the eye for those with hyperopia. These problems are greatly reduced, however, by the use of aspheric lenses. One of the few disadvantages of this type of eyeglasses is that the lenses tend to be positioned closer to the face, which can bring about visible reflections on the front and back of the lenses. The application of an anti-reflective coating to these lenses is therefore recommended by many eye care professionals. It is possible and very common for aspheric lenses to be manufactured by molding, and these are very inexpensive and perform reasonably well. Now we only have power range: 0.*0~*8.*0/*0.*5~*2 and *8.*5~**0.*0, diameter *0mm. Hard coating and 7 layer multi coating are available. Welcome to talk to us!