u003cbru003eMany friends think that only myopia glasses
or contact lenses have an expiration date, and there is no concept about the expiration date of sunglasses. The glasses remind our friends that the expired sunglasses can easily damage the eyes. If they are not replaced in time, they can easily affect the eyesight. Because the material of the sunglasses lens will age over time, coupled with improper wearing habits and care methods, it is easy to reduce the life of the sunglasses, and long-term wearing of expired sunglasses will bring great damage to the eyesight . Glasses remind those who use sunglasses, if your lenses have been scratched, wearing glasses are prone to fatigue, dizziness, etc., please change your sunglasses in time, and choose sunglasses with UV protection capabilities when buying new sunglasses. .
u003cbru003eWhat is the real function of sunglasses?
u003cbru003eAlthough the scorching summer is coming to an end, sun protection is still indispensable, especially sunglasses. At this time, some people will think that it is unnecessary. I can only say that you don't understand the real function of sunglasses. Nowadays, many people use sunglasses with concave shape, or use sunglasses for sun shading. Many people think that the real function of sunglasses is to prevent ultraviolet rays. So before you wear sunglasses, you might as well understand the real function of sunglasses! One of the main functions of sunglasses is to filter ultraviolet rays. Excessive ultraviolet (UV) exposure in the sun can cause diseases such as cataracts, pterygium, eyelid skin cancer, and electro-optic ophthalmia. Even if you wear a hat with a wide brim, it can only block 50% of the ultraviolet rays reaching your eyes, so you need to wear sunglasses. Recommended reading: How to distinguish whether sunglasses are UV-resistant and sunglasses can also filter short-wavelength blue light. Studies have found that long-term exposure to ultraviolet and short-wavelength blue light is a risk factor for age-related age-related macular degeneration (AMD). In addition, comfortable visual experience is also one of the important factors for wearing sunglasses. The harsh sunlight will make the eyes uncomfortable and affect the clarity of vision. People will squint and shed tears. Wearing sunglasses will greatly increase the comfort. Those who wear sunglasses, don't treat sunglasses as fashion accessories, understand their true function, and don't lose too much.
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