How to choose color-changing lenses

Human pupils can continuously adjust themselves with changes in ambient light, but when the light changes too suddenly, the eyes will feel discomfort, fatigue and soreness. If you frequently go in and out of places with large changes in light and darkness, Maybe you need a pair of smart color-changing glasses, so how to buy a good pair of color-changing lenses?

[Look at the discolored parts]

Base change: the more traditional color changing technology, the lens is mixed with the color changing agent in the raw materials, and the whole lens is full of the color changing agent after production, so the discoloration part is on the lens.

Film change: The new type of discoloration technology refers to spin-coating a layer of discoloration film on the surface of the lens to realize the discoloration of the lens, and its discoloration part is on the film layer on the surface of the lens.

Since the color change part of the base color change lens is in the lens material, the color change product line is relatively short. Because the color change part of the film color change lens is on the surface of the lens, it will not be restricted by the material, regardless of ordinary aspheric surface, progressive, anti-blue light, 1.56, 1.60, 1.67, 1.71, etc. can be processed into film-variable lenses. There are many varieties, and consumers have a lot of choice.

[Look at the speed of color change]

Traditional color-changing lenses mostly rely on the ion reaction of silver bromide and the separation and re-oxidation and polymerization of silver ions to achieve color change. The latest film-change technology uses spiropyran compounds, which have better light. Responsiveness uses the reversal opening and closing of the molecular structure itself to achieve the effect of passing or blocking light, so the color change speed is faster.

[Look at the uniformity of discoloration]

In traditional color-changing lenses, because the color-changing agent is added inside the lens material, the color-changing effect will be affected by the thickness of different areas of the lens. The center of the lens is thin and the periphery is thick. Therefore, the center area of the lens discolors or recovers slower than the surrounding area, and the panda eye effect will appear. The smart color-changing lens with film change technology adopts the uniform spin coating technology of the film layer to ensure the consistency of the film layer thickness and the color change more uniformly.

[Look at the life of the color-changing lens]

The service life of the general color changing lens is 1-2 years, but many companies are trying to extend the service life of the color changing lens. After the lens is spin-coated and discolored, it will be strengthened and coated, plus the color changing substance used-spiropyran The compound itself also has good light stability. Discoloration is the reversal of the molecular structure itself to absorb light, and the discoloration function is maintained for a longer time, which can basically reach more than two years.