The degree of discoloration of the photochromic lens is related to the temperature of the lens heat treatment and the temperature during use. Let's follow the editor of Single Vision Photochromic Darker lens to have a simple understanding!
Photochromic lenses are more sensitive to temperature, and temperature causes changes in optical density and speed. When the temperature rises, the discoloration speed of the lens is fast. At the same time when the temperature is low, the discoloration speed of the lens is relatively slow and the fading is slow. This is the reason why the discoloration depth of the photochromic lens in summer is not as deep as in winter. For the same pair of lenses In terms of the depth of discoloration outdoors in winter, the fading speed of returning indoors is slow; in summer, the discoloration speed is much faster, but the depth of discoloration is not as deep as in winter (the depth of discoloration in summer is shallow, but the shading rate of visible light decreases. , But the shielding rate of ultraviolet rays has not decreased, so the protective effect has not decreased). The heat treatment temperature is high, the discoloration is deep; the temperature is low, the discoloration is shallow, when using, the light is strong, the color is deep, and the light is weak, the color is light. Temperature has a great influence on the transmittance of visible light. Under the same conditions, the temperature is high and the color changes lightly, that is, the visible light transmittance is large. When the temperature is low, the color change is deep and the visible light transmittance is small. This kind of photochromic lens is particularly suitable It can be worn by workers outdoors and on snow. It can not only correct eyesight, but also protect the eyes from strong light stimulation and prevent ultraviolet and infrared rays from damaging the eyes. Photochromic lenses generally have low light transmittance under ultraviolet and violet light, but have higher light transmittance under red light and infrared light.

The phenomenon of light discoloration of photochromic lenses in high-temperature climates is common, but sometimes due to the appearance of insensitive stripes, after the discoloration, a white streak that does not change color appears on the mirror surface, which makes the mirror tone uneven, so it must be It is necessary to check whether the color tone is uniform after the change in the sun, and whether there is any insensitive line streaks. The current level of science and technology can not completely solve this problem, but there are still big differences in this aspect of different quality of photochromic lenses. In this regard, improvement and continuous adjustment are needed to make the quality of photochromic lenses even further.
The above is the story of the editor of Single Vision Photochromic Darker lens: a brief introduction to the relevant knowledge of photochromic lenses.