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Wenzhou Wanrun Glasses Co., Ltd.: What is the knowledge of glasses

What knowledge do we have to know when fitting glasses? Wenzhou Wanrun Glasses Co., Ltd. tells you that it is easier for us to match glasses with high cost performance.

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What knowledge do we have to know when fitting glasses? Wenzhou Wanrun Glasses Co., Ltd. tells you that it is easier for us to match glasses with high cost performance. Lenses are the soul of a pair of glasses. The lenses are mainly divided into glass, resin and PC. The glass lenses have high refractive index and are relatively thick; Resin lens is the current mainstream, not fragile, and the price is moderate; Compared with resin lens, PC lens is lighter and more flexible, which can be selected according to personal needs.

With regard to the refractive index of lenses, some salesmen will mislead customers, saying that the higher the refractive index, the better the quality of lenses, the higher the price. In fact, the higher the refractive index, the worse the optical index may be. (This should be selected according to your own degree.) Here are some suggestions for selecting the refractive index. You can refer to them. Refractive index: 1.56, suitable degree 0 ° - 400 °; Refractive index: 1.60, suitable for 300 ° - 600 °; Refractive index: 1.67, suitable for 400 ° - 800 °; Refractive index: 1.74, suitable for 800 ° and above.

The Abbe number of the lens reflects the imaging quality of the lens. The higher the Abbe number, the better the imaging quality. Generally, the Abbe number of the lens is between 30-60. Today's lenses are coated, which is where the gap between major high-end brands is widened and where it is most easy to deceive people. Among the many functions of coating, only anti-reflection and increasing permeability are necessary. As for anti-radiation and anti-blue light, you can choose according to your own needs.

About the thickness of the lens. The deeper the degree, the thicker the astigmatism; The lower the refractive index, the thicker it is; Spherical surface is thicker than aspheric surface; The wider the lens, the thicker the lens edge; The smaller the pupil distance, the thicker the lens. Selection of mirror frame; The quality of the glasses frame is closely related to the comfort of wearing glasses and the durability of glasses. The material of the mirror frame mainly includes plate, tr, metal and titanium frame. Tr is a new type of material, light and flexible, which is popular with young people; The metal frame is relatively heavy, but durable. The titanium frame is the lightest, comfortable and a little expensive. You can choose 0 according to your personal needs.

Like clothes, the frame has its own size, and there will be a series of numbers on the leg, bridge of nose or sign, such as 60 pieces of 18 135, which means the frame width is 60mm, the bridge of nose is 18mm, and the leg is 135mm. The article comes from the internet. If there is any infringement or violation, please contact us for deletion and correction.

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