Going out to play, the sun is shining in the summer, and people can't open their eyes. In addition to the umbrellas and hats that can be shaded, sunglasses are the best weapon against ultraviolet rays. Glareous light can penetrate your eyes and cause harm. Sunglasses can reduce the strong sun's damage to the eyes. The harsh light can cause headaches. Sunglasses have a filter effect of 95 to 100.
Most people still choose sunglasses for aesthetic considerations. They think that sunglasses are modern accessories. The appearance of glasses is the first consideration when buying. Even the clothing store will put a lot of sun. Glasses for people to buy to match costumes. Although sunglasses have the function of decorations, their protective functions are the most important. Because if there is no moderate blocking of UV rays, it will cause eye damage in the long run. Ultraviolet light should be absorbed by the crystal. If the absorption is incomplete and it enters the retina, macular degeneration of the retina will occur. If the absorption is incomplete, it will enter the crystal and cause turbidity of the lens, resulting in serious eye diseases such as cataract. Therefore, if you wear a pair of bad glasses, in addition to no protection of the function, but it hurts the eyes it would not be worth it. How to choose a suitable pair of sunglasses?
Common five kinds of stained lenses:â— Pink lenses: This is a very common color. It absorbs 95% of ultraviolet light, and some shorter wavelength visible light. In fact, such a function is similar to that of a general uncolored lens, which means that the pink lens does not have a greater protective effect than a normal lens. However, for some people, there is still a considerable psychological benefit, because they feel comfortable to wear.
â— Gray lenses: absorb infrared and 98% of UV rays. The biggest advantage of the gray lens is that it does not change the original color of the scene due to the lens, and the greatest satisfaction is that it can reduce the light intensity very effectively.
â— Green Lens: Green Lens can be said to be represented by Ray-Ban Series lenses. Like the gray lenses, it can effectively absorb infrared light and 99% of ultraviolet rays. However, the green lens will make the color change of some scenes distorted. Moreover, its light blocking effect is slightly inferior to gray lenses, however, green is still not a good protective lens.
â— Brown lenses: This type of lens absorbs light in the same manner as green lenses, but absorbs more blue light than green lenses. Brown lenses cause the distortion of the colors to be greater than those of gray and green lenses. Therefore, the average person's satisfaction is also lower. But it offers another color choice, and can reduce the blue halo slightly, making the image clearer.
â— Yellow lens: absorbs 100% of UV rays, and allows infrared rays and 83% of visible light to penetrate the lens. The biggest feature of yellow lenses is the absorption of most of the blue light. Because the sun shines through the atmosphere, it is mainly expressed in blue light (this can explain why the sky is blue). After the yellow lens absorbs the blue light, it can make the natural scene more clear. Therefore, the yellow lens is often used as a "filter" or used by hunting people when hunting. However, no one can prove that the shooter is better because of wearing yellow glasses.
Buy sunglasses should pay attention to:
â— The human body has self-protective instinct response. When the eyes meet with strong light, the pupil will naturally become smaller, so that the ultraviolet energy entering the eyes will be reduced. Once wearing glasses without UV protection function, the pupil will be enlarged, plus this Glasses do not have the effect of isolating ultraviolet rays. At this time, the eyes are equal to the door open, letting the ultraviolet rays enter and the damage to the eyes can be imagined.
â— Sunglasses can block ultraviolet rays because a special layer of film is added to the lens. In addition to the fact that poor quality sunglasses can't block ultraviolet rays, the lens's light transmittance is seriously reduced, so that the pupil becomes larger, and ultraviolet rays can be injected in large quantities. Damaged. In addition, poor quality lenses also cause nausea, forgetfulness, insomnia and other visual fatigue symptoms.
â— The color of the sunglasses is light grey, brown or light smoke, followed by green, amber, blue, etc. The red color is only used for sunbathing or snow.
â— It is best to use polarized sunglasses for car rides because they can reduce glare.
â— If you wear sunglasses, others can see your eyes very clearly, then your lenses are too light.
â— When the sun goes down, it is best to remove the sunglasses, otherwise we will be affected by vision in weak light.
â— should go to the regular optical shop to choose regular manufacturers produce sunglasses with UV protection function.
â— Pay attention to the surface of the lens when selecting it.
â— People with longer face are suitable for round frame sunglasses.
Medical experts suggest that when buying sunglasses, you can judge according to whether the visual material is clear or not. To buy quality sunglasses, the only thing that can be done is to purchase sunglasses from optical specialty stores and regular optical shops.
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