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What is the appropriate diameter of dyed sunglasses lens?

The diameter of dyed sunglasses lens is appropriate, with a diameter of 75mm, and the limit degree of the lens is affected by the diameter and surface curvature. The higher the curvature, the smaller the diameter of the lens. In order to meet the requirements of large-frame sunglasses, the base diameter of most customized dyed patches is set to 75 mm