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Discoloration of mirror photochromic lenses

Discoloration of mirror photochromic lenses

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  • Time of issue:2021-01-27 16:35
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(Summary description)Under full light conditions, the mirror photochromic lenses starts from a very small amount of residual background color (the light transmittance is about 90%, which can meet the normal indoor vision of most people), and then changes to different degrees according to their respective compositions Dark color.

Discoloration of mirror photochromic lenses

(Summary description)Under full light conditions, the mirror photochromic lenses starts from a very small amount of residual background color (the light transmittance is about 90%, which can meet the normal indoor vision of most people), and then changes to different degrees according to their respective compositions Dark color.

  • Categories:Company news
  • Author:
  • Origin:
  • Time of issue:2021-01-27 16:35
  • Views:
Information

Under full light conditions, the mirror photochromic lenses starts from a very small amount of residual background color (the light transmittance is about 90%, which can meet the normal indoor vision of most people), and then changes to different degrees according to their respective compositions Dark color.

The type of radiation incident on the lens and the surrounding temperature are two complex factors that affect the depth of the lens. Most of the darkening effect is due to the influence of ultraviolet rays, not visible light, and behaves differently with temperature changes. Heat will cause the photochromic material to bleach, so in summer, the darkening effect tends to weaken. Lens manufacturers have also been committed to mirror photochromic lenses. The photochromic materials developed in recent years have been able to reduce the dependence on temperature.

Darkening rate: The color darkening rate mainly depends on the optical density of the lens material, usually from a few seconds to a few minutes from a large light transmittance to a small light transmittance.

fading rate: the fading rate depends on the composition of the lens and the heat treatment during the manufacturing discoloration. It also takes a few seconds to a few minutes to go from a small light transmittance to a large light transmittance.

The rate at which the photochromic material darkens and fades is very important. Current products change color very quickly, but it is not a good thing that lenses change color too quickly, and may even be dangerous. It is not ideal if the lenses used for driving change color immediately. It takes a few seconds for our eyes to fully adapt to changes in lighting conditions. If the time for the lens to darken is close to the time for the eyes to adapt to changes in light, it is an ideal ratio. The bleaching rate or fading rate of the lens is also important. The wearer who enters the room does not want the lens to fade to a comfortable state for too long. Any color-changing lens should be able to fade back to 60%-70% light transmittance within a few seconds, and reach 85% light transmittance in about 15-20 minutes.

Temperature affects the change of mirror photochromic lenses. In the process of deepening the color, the heat treatment at a higher temperature will have a higher light transmittance, while the heat treatment at a lower temperature will have a lower light transmittance. The rate of fading can be accelerated by additional heat or by light waves that are longer than the wavelength that darkens the color of the exposed lens. Color-changing lenses generally have low light transmittance under ultraviolet and violet light, but have higher light transmittance under red light and infrared light.

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