In the hot summer, ultraviolet rays will become stronger. On the basis of fatigue, the eyes will also face the challenge of ultraviolet rays. Strong ultraviolet rays can sometimes cause “devastating” blows to the eyes.
How much harm can ultraviolet rays cause to our eyes? Solar ophthalmia, which we often hear about, is acute eye damage caused by strong sunlight. After the clouds, calm water surface, or large areas of snow reflect sunlight, the cornea of the outermost layer of the eyeball is burned by ultraviolet radiation. The eyes will experience severe pain, dryness, tears, gravel foreign body sensation, conjunctival congestion, edema, etc. Too strong sunlight can also induce chronic eye diseases, such as cataracts, macular degeneration, pterygium, chronic conjunctivitis, etc. “If you look directly at the sun, it may also cause eclipse retinitis.” It is necessary to have a pair of sunglasses in summer!!
The role of sunglasses
01 Prevent exposure to ultraviolet rays in sunlight
The main function of sunglasses is to prevent ultraviolet rays in sunlight from causing damage to the eyes. When the eyes are exposed to too much light, the iris will naturally contract to reduce the amount of light entering, but when the light intensity exceeds the human eye’s ability to adjust, it will damage the retina. Sunglasses can filter out up to 97% of the light entering the eye, thus avoiding this damage. In addition, sunglasses can block not only ultraviolet rays but also infrared rays, further protecting the eyes from damage.
02 Prevent glare exposure
One of the main functions of sunglasses is to prevent glare exposure. Some surfaces, such as water, can reflect a large amount of light, causing a strong sense of glare. This glare can disrupt vision or make objects appear blurry. Polarized lenses can effectively eliminate this glare. The polarizing bar in the middle of the lens can block all kinds of disordered light, turning the light into parallel light to enter the eyes, thereby improving visual clarity.
03 Block wind and sand
Sunglasses play an important role in blocking wind and sand. When people are in a windy and sandy environment, the lenses of sunglasses can effectively block flying sand and reduce the irritation and damage to the eyes caused by sand particles. In addition, the frames of sunglasses are usually designed to be tighter, which can further prevent wind and sand from invading the eyes. Therefore, in windy and sandy weather or outdoor activities, wearing sunglasses not only helps protect the eyes from wind and sand but also improves visual comfort.
How to choose sunglasses correctly
Wearing sunglasses or sunglasses requires wearing them at the hospital’s optical center. Choosing glasses that are suitable for you can not only achieve the purpose of beauty but also reduce the ultraviolet radiation in the sun, making the eyes comfortable and lasting. The use of sunglasses or sunglasses needs to be carried out under the correct guidance of optometrists to avoid eye damage due to inappropriateness.
So, facing a wide range of sunglasses, how should we choose? It is necessary to prepare a pair of sunglasses in summer, but if you choose a pair of inferior sunglasses, it will not only fail to resist ultraviolet rays but also dilate the pupils and make the eye lens absorb more ultraviolet rays. Therefore, when choosing sunglasses, one must take into account both health and decoration. Generally speaking, we cannot tell with the naked eye whether a pair of sunglasses has the function of anti-ultraviolet. The product logo is a reference for consumers to buy sunglasses. Citizens can see logos such as “UV400″ and “Block all ultraviolet rays” on the labels of some products and on the front of glasses. Experts suggest that in order to protect the health of the eyes, you should choose sunglasses with UV protection to eliminate ultraviolet rays below 380nm as much as possible.
Lenses should be gray, brown, or green.
“The effects of different colors of sunglasses lenses are not the same. Brown lenses can absorb purple and blue in the light, almost absorbing 100% of ultraviolet and infrared rays, and the soft color makes the eyes less tired; gray lenses can completely absorb infrared rays and most of the ultraviolet rays without changing the original color of the scenery; green glasses can also absorb all infrared rays and 99% of ultraviolet rays, which is also good for eye protection. The color of the lens should be selected based on the principle that the color of the surrounding environment is not distorted, the edges of objects are clear, and different colors of traffic lights can be effectively identified. Studies have found that the blue light in sunlight can harm people’s eyes, and blue lenses cannot filter out the blue light in sunlight. Therefore, it is best not to choose blue lenses when choosing sunglasses. Generally speaking, the darker the color of the lens, the stronger the light-blocking effect, but it does not mean that the ability to prevent ultraviolet rays is stronger. The color of the sunglasses lens is generally medium depth, otherwise, it is difficult to identify the color of the traffic light.
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Post time: Sep-02-2024