What are the pros and cons of photochromic myopia glasses?

There are many people who usually wear myopia glasses. Now there is a kind of photochromic glasses. The biggest feature of this kind of glasses is that they can change color. It is said that this kind of glasses can sense the surrounding light and adjust the color according to the surrounding environment. For example, when going out in the sun, such glasses can play a role of sun protection because of the color change, so they are deeply loved by young people. So what are the advantages and disadvantages of this kind of photochromic myopia glasses?

Advantages and disadvantages of photochromic myopia glasses:

Photochromic glasses have actually been very popular for a long time. The lenses are made of optical glass containing silver halide microcrystals. Based on the principle of reversible photochromic reaction, they can darken quickly under sunlight and ultraviolet rays, completely absorb ultraviolet rays, and have neutral absorption for visible light; when returned to darkness, they can quickly return to colorless and transparent. So it is very convenient to wear. The popularity of photochromic lenses is of course an advantage, but in fact, it is harmful for some people to wear them. Let me explain it to you.

The benefits of different color-changing lenses

1. Gray lens: can absorb infrared rays and 98% of ultraviolet rays. The biggest advantage of gray lenses is that the original color of the scenery will not be changed by the lenses, and the most satisfactory thing is that it can effectively reduce the light intensity. Gray lenses can absorb any color spectrum evenly, so the scene will only become darker, but there will be no obvious color difference, showing a real and natural feeling. It is a neutral color and suitable for all kinds of people.

2. Brown lenses: They can absorb 100% of ultraviolet rays. Brown lenses can filter out a lot of blue light, which can improve visual contrast and clarity, so they are very popular among wearers. It is especially effective when worn in severe air pollution or foggy conditions. Generally, it can block the reflected light from smooth and shiny surfaces, but the wearer can still see the fine details, making it an ideal choice for drivers. Priority can be given to middle-aged and elderly patients with high vision above 600 degrees.

3. Green lenses: Green lenses, like gray lenses, can effectively absorb infrared light and 99% of ultraviolet rays. While absorbing light, it maximizes the amount of green light reaching the eyes, so there is a cool and comfortable feeling, suitable for people whose eyes are easily tired.

4. Pink lenses: This is a very common color. It can absorb 95% of ultraviolet rays. If the glasses are used to correct vision, women who have to wear them frequently are advised to choose pink lenses, because pink lenses have better absorption of ultraviolet rays and can reduce the overall light intensity, so the wearer will feel more comfortable.

5. Yellow lenses: can absorb 100% of ultraviolet rays, and allow infrared rays and 83% of visible light to penetrate the lenses. The biggest feature of yellow lenses is that they absorb most of the blue light. Because when sunlight passes through the atmosphere, it appears mainly as blue light (which explains why the sky is blue). After yellow lenses absorb blue light, they can make natural scenery clearer. Therefore, yellow lenses are often used as "filters" or by hunters when hunting.

Who are not suitable for color-changing glasses?

Glaucoma patients should not work or read for too long in the dark. Although photochromic lenses are very light in color under natural light indoors, they still have a great impact on their vision. Therefore, patients with glaucoma, especially those with narrow-angle glaucoma, are better not to choose photochromic lenses.

In addition, people with high myopia or hyperopia are advised to choose clear white lenses when choosing lenses. Since the refractive power is too high, the color depth of the photochromic lenses is inconsistent, which will affect the clarity of vision. Therefore, people with high myopia or high hyperopia should not wear photochromic lenses.