The brief idea of photochromic dye is a photoreaction as known as photochromism, under the effect of ultra violet light. In here the merocyanines will begin the chemical reaction, and turns from transparent color to different color to increase the transmittance and block sunlight, and maintain good transmittance percentage to observe by human without compensating their sport performance.
The merocyanines is a close loop chemical reaction caused by absorption of ultraviolet. It is a reversible conversion of color in on organic and inorganic material. In here, we apply the inorganic material, which is thermoplastic lens. The type of thermoplastic includes polycarbonate (PC) and Nylon ( TR90).
Photochromism of photo chromatic dye triggers by two common forms of energies, heat and sun light.
When merocyanines is illuminated by the ultra violet ray or sunlight, it initiates the transformation of a molecule into a different isomer, from a closed ring to an open ring. As the compound is exposed with sun light or ultraviolet light, the isomerization state of the compound form from a locked ring to an open ring, and it becomes a intermediate energetic state (metastable) merocyanine body forms with colors.
Moreover, the merocyanine body restore to its original ring closed body and become transparent when the substance is away from ultraviolet rays or sunlight or heat. The time of restoration of color of closed body may affect the change or delay due to the condition of weather, UV light, and heat.
Please see in below for our report of Sunmax Optical Co Ltd photochromatic Lens Reports.
Cat 0 - Cat 4
- Photochromatic Lens Cat 0 - 4