Answer :
Photochromic lenses can change from one color in the lightened state to a different color in the darkened state. This is made possible by the photoactive substances they contain, which react to UV light. The lightened color is determined by pigments added to the lenses, while the darkened color depends on the type and amount of photoactive substances in the lenses.
Yes, it is technically possible to produce photochromic lenses that start with one color in the lightened state and then darken to a different color. Photochromic lenses operate based on the principle of photoactivity, made possible by organic microcrystalline molecules embedded within the lenses. These molecules can alter their properties when they are exposed to UV light, such as sunlight.
When these molecules encounter UV light, they initiate a photochemical reaction that results in a color change in the lenses. This is the reason why photochromic lenses darken in sunlight. When not exposed to UV light or in artificial lighting, these molecules return to their original state, and the lenses become clear again.
To have a colored lightened state, pigments could be added to the lens material. However, this could affect the clarity of the vision when the lens is not in the darkened state. As for the darkened state, adjustments in the type and amount of photoactive substance or a combination of substances used can allow for different color changes within the lens. Various factors, including UV intensity, wavelength of the light, and type of photoactive substances, can influence the eventual color of the darkened lenses.
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