In the case of the same manufacturing process, how do you know which customized 1.56 Finish Photochromic Progressive Brown lens from China has better performance? To answer this question, you need to understand the key indicators that affect the comfort and function of lenses.The first is the initial transmittance. The initial transmittance of the customized 1.56 Finish Photochromic Progressive Brown lens refers to the state of the lens before discoloration. The higher the transmittance, the more transparent the lens is. The second is the color change speed: it refers to the time it takes for the customized 1.56 Finish Photochromic Progressive Brown lens from China from the initial to the deepest state. Generally speaking, the faster the better, but the performance difference between brands is not large in this regard.
Depth of discoloration: The deepest state that the customized 1.56 Finish Photochromic Progressive Brown lens can achieve under the test conditions, the discoloration depth is not only affected by materials and processes but also related to the use environment (temperature) of the customized 1.56 Finish Photochromic Progressive Brown lens from China. In summer, the discoloration will be shallow, and in winter, the discoloration will be deep outdoors, so the depth of discoloration depends on the application.