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1.56 Semi Finished Bifocal Photo grey optical lenses
In general, color-changing myopia glasses can not only bring convenience and beauty but also can effectively resist ultraviolet and glare, can protect the eyes, the reason for color change is that when the lens is made, it is mixed with light-sensitive substances, such as silver chloride, silver halide (collectively known as silver halide), and a small amount of copper oxide catalyst. Whenever the silver halide is illuminated by strong light, the light will decompose and become many black silver particles evenly distributed in the lens. Therefore, the lens will appear dim and block the passage of light. At this time, the lens will become colored, which can well prevent the light to achieve the purpose of protecting the eyes.
