01, what is photochromic lens?

Color-changing lenses (photochromic lenses) are lenses that change color in response to changes in UV intensity and temperature.
Color-changing lenses are made by adding different photosensitizers (such as silver halide, silver barium acid, copper halide and chromium halide) to common resin lenses.
After the change of color can be different colors, such as: tea, tea grey, grey and so on.


02, color changing process

At present, there are two kinds of discoloration technology on the market: film discoloration and substrate discoloration.
A. Film discoloration
Spray discoloration agent on the surface of the lens, characterized by light background color nearly colorless.
Advantages: rapid color change, color change more uniform.
Disadvantages: The discoloration effect may be affected by high temperature.
B. Substrate discoloration
The discoloration agent has been added in advance in the processing of the monomer material of the lens.
Advantages: Fast production speed, cost-effective products.
Disadvantages: The color of the middle and edge parts of the height lenses will be different, and the aesthetic is not as good as the film discoloration lenses.

03. Color changes of discolored lenses

The darkening and lightening of color-changing lenses are mainly related to the intensity of ultraviolet radiation, which is also closely related to the environment and the season.
Sunny day: The air in the morning is less cloudy and has less UV blocking, so the photochromic lenses in the morning will be darker. In the evening, the ultraviolet light is weaker and the lens color is lighter.
Overcast: Although the ultraviolet light is weak in the overcast environment, it can also be enough to reach the ground, so the discoloration lens can still play a certain protective role, the color will be relatively light in the sunny environment.
Temperature: Usually, as the temperature increases, the color of the discolored lens will gradually become lighter; Conversely, as the temperature drops, the chameleon slowly darkens.
Indoor environment: In the room, the color changing lens will hardly change color and remain transparent and colorless, but if affected by the surrounding ultraviolet light source, it will still have a color changing effect, which plays the ultraviolet protection function at all times.

04. Why choose color-changing lenses?

With myopia rates on the rise, there is a growing demand for color-changing lenses, especially in spring and summer, when the sun shines brightly and UV rays are intense, potentially damaging to the eyes.
Therefore, the best way to protect your eyes from UV rays while also dealing with refractive problems is to wear color-changing glasses with UV protection (a pair of color-changing glasses with a diopter).

05, the advantages of color-changing lenses

A mirror multi-purpose, avoid picking and wearing trouble
Shortsighted people need to wear a pair of sunglasses if they want to block out the sun's ultraviolet rays after they have had their eyes corrected by refraction.
Color-changing lenses are sunglasses with diopter. If you have color-changing lenses, you do not need to have two pairs of glasses when you go out.
Strong shading, blocking UV damage
Color-changing glasses can automatically change color according to the light and temperature, and adjust the transmittance through the lens change color, so that the human eye can adapt to the change of environmental light.
In addition, it can absorb ultraviolet rays harmful to human eyes, block the glare and damage brought by ultraviolet rays, effectively reduce light reflection, improve visual comfort, reduce visual fatigue, protect the eyes.
Increase the decoration, beautiful and natural
Color-changing lenses are suitable for indoor, traveling, and outdoor environments. They are not only sunglasses that block the sun, but also myopia/farsightedness lenses that can correct vision.
Suitable for a variety of design of the lens, stylish appearance, to meet the pursuit of more fashion, collocation and practical both.


Post time: Dec-05-2022