Does the color-changing myopia lens have any shortcomings?

1, the patient's pupil will change with the color of the lens. For some patients, it will increase the burden on the eyes and easily lead to symptoms of visual fatigue.

2. When the environment enters other dark environments from bright light, there will be short-term dull symptoms, which will cause certain damage to the eyes. Because of the poor light transmission of glasses, the effect of treating myopia is not obvious.

Lens characteristics

(1) color change speed

The speed of color change is an important reference factor in purchasing color-changing lenses. The sooner the lens changes color, the better. For example, from darkroom to strong light room, the faster the lens changes color, and prevent the damage of strong light/ultraviolet rays to eyes in time.

Generally speaking, the color change speed of film color change technology is faster than that of substrate color change technology. For example, in the new film color-changing technology, the photochromic factor is spiropyran compounds, which have better light responsiveness, and use the reverse opening and closing of the molecular structure itself to achieve the effect of light transmission or light blocking, so the color-changing speed is faster.

(2) Uniformity of discoloration

Color change uniformity refers to the degree of lens color uniformity in the process of lens color changing from shallow to deep or from deep to shallow. The more uniform the color change, the better the color-changing lens.

In the traditional substrate color changing lens, the photochromic factor is on the lens substrate, and the color changing effect will be affected by the thickness of different areas of the lens. Because the center of the lens is thin and the periphery is thick, the color change in the center of the lens is slower than that in the periphery, and the panda eye effect will appear. The film color-changing lens adopts high-speed spin-coating technology to spin-coat the color-changing film evenly to make the color more uniform after color change.

(3) service life

Generally, the service life of color-changing lenses is about 1-2 years, but many enterprises are trying to extend the service life of color-changing lenses.

After spin-coating the color-changing layer, the image lens will also undergo enhanced coating treatment. In addition, the color-changing substance-spiropyrans itself has good light stability, and the color-changing function can be maintained for a longer time, which can basically reach more than two years.