How To Choose A Sunglasses?

For the choice of sunglasses, one is to look at the color and quality of the lenses, and the other is to look at the frame. There are many lens colors on the market. What's the difference? Gray lenses belong to the neutral color system, which can be integrated into various spectrums, without changing the basic color spectrum, and showing the most real feeling, so most of the eyeglass lenses are gray. Brown can filter out blue light a lot, improve the contrast and clarity of color vision. It is better to wear when air pollution is serious or foggy; green sunglasses can maximize the black luminosity and produce a good and comfortable feeling; blue-gray, the same as gray lenses It belongs to the neutral color system, its color is deeper, and the proportion of visible light that can be absorbed is higher.

So, let's check how sunglasses work in below：

The main function of sunglasses is to protect the eyes and avoid direct damage from ultraviolet rays. Silver lenses can reflect ultraviolet rays. Reflective, ordinary lenses only have a layer of coating on the surface. The more sophisticated ones will add a layer of blue anti-reflection and control-enhancing coating on the inside of the glasses, so you can see things more clearly. The inner coating also has an advantage to prevent the back surface from reflecting light. The silver coating is generally a toad lens. The lens is relatively large. The image of people or objects on the back side is likely to cause visual interference. This coating will eliminate this Reflection; 

There is also an absorption type. Some metal compounds are added to the lens to absorb the light of a fixed spectrum, so that the harmful spectrum can be selectively filtered out. This is the reason why ordinary sunglasses have a shading effect; 

The third It is the polarization type. The polarizer we often say is actually polarized sunglasses. It is actually the best protective effect among these three methods. The polarizer actually uses macromolecular compounds after heat treatment to form a polarized light grating film. The layer, so that only the light from the same direction of the grating can enter the eye, effectively preventing the irritation of the diffuse reflection to the human eye. You must wear polarized lenses for fishing and skiing to avoid glare.

The structure of the polarizer is made of two layers of films and materials plus a layer of polarizing film, so it is afraid of water erosion. A good polarizer manufacturer will coat the edge of the lens with a circle of waterproof material for protection, even if there is a waterproof material To protect, you should also pay attention to the myopia of organic materials in the sea water when you go to the beach.

When I talked about how to care for the eyes of middle-aged and elderly people, I said that cataracts are particularly harmful to human eyesight, and ultraviolet radiation is the main cause of cataracts. Glass polarized light was popular earlier, but resin polarized light is more popular on the market.

Next, let's talk about how to pick sunglasses?

First of all, it is necessary to prevent UV, and then see whether the lens is regular, what is regularity, that is, inferior sunglasses, frames and lenses, do not match, so if the lens is bigger, it will become deformed. How to check: Hold the sunglasses against the light. The original light is flat and a straight line. If it is not flat at the center point, it will feel concave and convex. This is a lens that is squeezed and deformed, not a smooth horizontal. The change is that there is irregular astigmatism. Wearing this kind of glasses is more harmful to human eyes.

Thanks for reading. 

Wenzhou Mike Optical. Co. LTD.

Sophie Yang

004@mikeoptical.com