The frame and lens are selected together

 The material of Round Red Eyeglasses lens can basically be divided into glass and resin, and the vast majority of the lens market is resin lens. To judge whether a resin Round Shape Glasses lens is qualified, generally the following parameters need to be referred to: transmittance, dispersion coefficient, refractive index, uv protection, curvature, Abbe number, specific gravity/density. The lighter the Aviator Glasses Frames, the better; Cat Eye Black Frame Glasses material should be suitable for skin, not allergic; Adult optometry once a year, adjust the appropriate degree, children, teenagers optometry once every six months, adjust the degree according to the optometry results; Glasses are usually replaced every two years.