1 Pair of New Retro Metal Circular Eyeglass Frames for Men and Women's Fashion Glasses Day and Night Dual-use

High-concerned chemical : None Element type : Basic Classic Style type : Oval Place Of Origin : China (mainland) Frame Material : Stainless steel Model Number : 1938 Gender : Unisex Lenses Material : Polycarbonate Origin : Mainland China Color changing lenses, when exposed to ultraviolet and shortwave visible light in sunlight, darken their color and reduce their light transmittance; In indoor or dark areas, the transmittance of the lens light increases, leading to fading and restoring brightness. Photochromic glasses can adjust the transparency of the lens by changing color, allowing the human eye to adapt to changes in ambient light, reducing visual fatigue, and protecting the eyes.