What kind of glasses are good

summary

As we all know, a pair of glasses is composed of spectacle frame and spectacle lens. Spectacle frame and spectacle lens are equally important. Choosing a good pair of glasses can not only correct eyesight, but also facilitate daily life. Today I will mainly talk about how to choose spectacle lens.

What kind of glasses are good

First: by material. At present, the lenses on the market are divided into glass, resin and PC according to the material. Glass lens is the most scratch resistant of all glasses, and its light transmission effect is also better. Under the same degree, it is thinner than other lenses, so it is the best lens in optical effect. However, because glass lenses are easy to break and pose a threat to eye safety, few people wear them. Resin lens is one of the best-selling glasses in the current glasses market. It has the advantages of light weight, not easy to break and low price, so it is a common choice for myopia glasses wearers. However, the wear resistance of resin lens is not as good as glass, so care should be taken when wearing. PC lens is also known as space film and space film. This is because PC lens has super toughness and is not easy to break, and its lens is also the lightest one among the lenses. It is often used as children's glasses. But this kind of lens is not resistant to high temperature and is easy to be deformed by high temperature. At present, there are basically no glass lenses on the market, most of them are resin and PC lenses.

Second: by brand. The brands of lenses are divided into domestic and imported brands. The imported brands such as Yishilu, Zeiss, Suna and haoya are well-known. The domestic brands such as Mingyue, Tianhong, Weixing and Tianrun are also the first-class lens manufacturers in China. However, it is worth noting that the price of imported lenses will generally be higher, and the transmittance and wear resistance will also be more excellent, which is suitable for some consumers with certain frame ability. However, domestic lenses are more cost-effective and suitable for the public. As for which one to choose, it should be decided according to one's own specific situation.

Third: match by degrees. The refractive index of spectacle lens is enough. In order to increase sales, many optical shops will recommend using high refractive lenses, which will make the glasses thinner. In fact, the refractive index of glasses is mainly enough. Generally speaking, 1.600 refractive index lens is recommended for those below 400 degrees, 1.67 lens is recommended for those above 500 degrees and below 800 degrees, and 1.74 lens is recommended for those above 800 degrees. Do not have to pursue high refractive index, choose the most important.

matters needing attention

In addition, there are spherical and aspherical lenses. Aspherical lenses have incomparable advantages such as more realistic imaging, so it is generally recommended to choose aspherical lenses. At present, most of the aspherical lenses on the market, spherical lenses have been very few.