What kind of computer glasses is high myopia?
In a large number of people with myopia, there are a lot of high myopia patients, these highly myopic patients in the purchase of the computer glasses lens, both to consider the degree of beauty after wearing, but also pay attention to the role of eye protection. So high myopia patients should choose what kind of lens? Moon computer glasses to remind you, high myopia patients in the selection of uouo computer eyewear should be considered from the following aspects: (1) lens material The lens materials are mainly glass, resin sheet and PC sheet (polycarbonate sheet) three. The main drawback is the glass lens in high myopia, the film is particularly prominent, resulting in spectacles on patients with nasal root and ear pressure increased significantly, the wearer often cannot tolerate. The latter two have been widely used in recent years due to their characteristics of light texture and strong plasticity. High myopia to choose the latter two is appropriate. (2) refractive index The refractive index refers to the ability to light the tortuous lens, lens thickness is the main parameters. Currently on the market, the refractive index of resin lens is generally between 1.49-1.74, the higher the refractive index, the thinner the lens, more than 1.60 of the ultra-thin computer screen glasses. For high myopia, refractive index should be chosen as high as possible lenses, but because of the production process and the relationship between materials, high refractive index lens prices tend to be higher. Therefore, to choose the appropriate price of high refractive index computer glasses lens. (3) aspherical lens Aspheric lenses should be chosen for high myopia. Aspheric lens has a specific centrifugal, that is, from the center to the edge of the lens gradually flattened, gradually reducing the curvature, so as to reduce the edge of the intensity of the excessive degree of refraction and astigmatism. Therefore, the aspheric lens is thinner than the normal Blue Light Blocking Computer Glasses lens at the same degree of refraction, and the aspherical lens aberration is only 10%-30% of the spherical lens 1/5. Therefore, the aspherical lens looks natural, not even deformation.