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1.59 PC Blue cut Bifocal Invisible Photochromic Gray HMC Optical lenses
As the name suggests, a bifocal mirror has two luminosity. Generally, it is used to see the distance, such as driving and walking; The following is to see the near luminosity, to see the near, such as reading, playing mobile phone and so on. When bifocal lens just came out, it was indeed regarded as the Gospel of myopia + presbyopia, eliminating the trouble of frequent pick and wear, but as people use, it is found that the shortcomings of bifocal lens also have many.
