1. The surface of the high-quality Best Finished Single Vision Photochromic Brown lens has no scratches, scratches, surfaces, and pits, and the lens is obliquely observed against the light, and the finish is high. There are no spots, stones, streaks, bubbles, cracks, and bright light inside the lens.
2. The two lenses need to be of the same color without any difference. They should be uniform and cannot present several colors. When you see the sun, the color time is fast, and when there is no sunlight, the color fade time is also fast. Inferior lenses are slow to color, or change color quickly and fade slowly. Poor chromatic lenses are not tinted at all.

3.Best Finished Single Vision Photochromic Brown lens The thickness of the two lenses should be the same, not one thick and the other thin, otherwise it will affect vision and damage eye health. The thickness of the single piece should also be uniform. If it is a color-changing flat lens, the thickness should be about 2mm, and the edge is smooth.
The above is an introduction to the method of judging the pros and cons of Best Finished Single Vision Photochromic Brown lens.