What are the characteristics of high-quality color-changing lenses

The color-changing lens glasses automatically change the color according to the change of sunlight intensity to protect eyesight, improve aesthetics, and reduce the irritation and damage of sunlight and ultraviolet rays to the eyes. When choosing a color-changing lens, it is impossible to choose only the right color without choosing high-quality lenses. There are many inferior glasses on the market. A pair of inferior glasses that have not been precisely processed and passed the inspection will distort the image you see, consume your eyesight, fatigue your eyes, and induce various eye diseases. So what are the characteristics of high-quality color-changing spectacle lenses? (1) The surface of high-quality color-changing spectacle lenses has no scratches, scratches, 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 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. (3) The two lenses of the color-changing glasses must be the same color without any 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; 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. (4) Fast discoloration speed: A high-quality color-changing mirror has a quick response to the environment. Put the color-changing mirror under sunlight for about 10 minutes, that is, a large color depth should be achieved, otherwise the discoloration quality is poor. Move the glasses that have been discolored under the fluorescent lamp to a dark place, and the lenses whose re-bright time does not exceed 20 minutes are high-quality color-changing glasses. (5) There is no feeling when wearing, no dizziness, no swelling, no blur or deformation of the observed object. When buying, hold the glasses, look 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. (6) Protection, high-quality color-changing glasses can block ultraviolet A and ultraviolet B 100%, providing effective UV protection for wearers. Related reading: with glasses and color-changing spectacle lenses
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