The Appropriate Eyeglasses Lens Diameter Need The Complete Assembly Frame Size
Friends with myopia often pay more attention to the edge thickness of the lens, hoping that the thinner the better. In terms of the cheapest eyeglasses lens design, for lenses with the same refractive index, if the edge thickness is made thinner, the center thickness will also be thinner.   Compared to defocusing lenses, single-lens lenses have thicker centers and thicker edges. Why...
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