When choosing lenses, the proportion of color-changing lenses is increasing on the eyeglass mart. The darkening and lightening of colors are mainly related to the intensity of ultraviolet radiation, which is mainly related to the season. It is stronger in summer and weaker in winter. In addition, moisture and the ozone layer in the air can block ultraviolet radiation.
The moisture in the air is related to the season, with high humidity in summer and low humidity in winter. Color-changing lenses are microcrystals containing color-changing factors such as silver halide and copper oxide in the eyeglass online lens.
When exposed to strong light, silver halide decomposes into silver and bromine, producing tiny silver grains that give the lens a dark brown color; When the light becomes dim, silver and halogen are catalyzed by copper oxide to regenerate silver halide, resulting in a lighter color of the lens.
In the morning, the air and clouds are thin, and there is less obstruction of ultraviolet rays, so there is more contact with the ground, so the depth of the color-changing discount prescription glasses lenses in the morning is also relatively deep. In the evening, ultraviolet rays are relatively weak because the sun is far from the ground in the evening, and during the day, most of the ultraviolet rays are blocked by the accumulation of fog; So at this point, the depth of color change is very shallow.
On cloudy days, ultraviolet rays are sometimes not weak and can reach the ground, so color-changing lenses can still change color. It is almost colorless and transparent indoors, and color-changing lenses can provide UV and glare protection in any environment. The lens color can be adjusted promptly according to the light, providing health protection for the eyes anytime and anywhere while protecting vision.
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