u003cbru003e1. The surface of the high-quality color-changing glasses
lens has no scratches, abrasions, rough surfaces, or pits. The lens is obliquely facing the light and the finish is extremely high. There are no spots, stones, streaks, bubbles, cracks inside the lens, and the lens is bright and transparent. 2. The two lenses of the color-changing glasses must be the same color without difference. The color change must be uniform, and it cannot show several colors. There is no 'yin and yang color'; when it sees sunlight, the color change time is fast, and when there is no sunlight, the color fade time is also fast. Inferior lenses change color slowly and fade quickly, or change color quickly and fade slowly. Poor color-changing glasses do not change color at all. 3. The thickness of the two lenses of the color-changing lens should be the same, not one thick and the other thin, otherwise it will affect the vision and damage the health of the eyes. The thickness of the single lens should also be uniform. If it is a color-changing plan lens, the thickness should be about 2mm with smooth edges. 4. There is no sensation when wearing, no dizziness or swelling, no blur or deformation of the observed object. When buying, hold the glasses, see through the lens with one eye, and shake the lens up and down, so that the distant objects should not have the illusion of movement. 5. Fast discoloration speed: high-quality color-changing mirrors have a quick response to the environment. Put the color-changing mirrors in sunlight for about 10 minutes, that is, it should reach a large color depth, otherwise it means that the quality of the discoloration is poor. Move the glasses that have been discolored under the fluorescent lamp to a dark place, and the lens should not exceed 20 minutes for the rejuvenation time to be a high-quality color changing lens. 6. Protection: high-quality color-changing glasses can block 100% of ultraviolet A and ultraviolet B, providing effective UV protection for wearers. Related reading: with glasses and color-changing spectacle lenses
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