Summer is hot,We all know that we need to protect our skin,But sun protection for the eyes,Are you ready?
Sunglasses, as a kind of sun-shading glasses, belong to human body protection products. The main function of sunglasses is to prevent irritation and damage caused by external ultraviolet rays to human eyes and provide a comfortable visual environment. Without proper protection of our eyes, long-term exposure to the sun will increase the risk of diseases such as cataracts.
Therefore, sunglasses are true summer must-haves.
According to the lens type, sunglasses can be divided into uniform (dyed) color sunglasses, gradient (dyed) color sunglasses and polarized sunglasses . Different groups of people can choose according to their preferences and uses, but it is the most basic principle to protect the wearer's safety and vision.
The basic requirements of sunglasses are to reduce the irritation of strong light, to see clearly without distortion, to prevent ultraviolet rays, to recognize the color without distortion, and to accurately identify the traffic signal. However, in fact, many consumers take comfort and style appearance as their main considerations when purchasing, which is actually unscientific.
To choose sunglasses correctly, first consider the filtering function of sunglasses against harmful light. The stronger the filtering function, the better the protection effect. It is recommended to go to a regular glasses store to choose sunglasses with anti-ultraviolet function produced by regular manufacturers.
If you buy sunglasses in shopping malls or online stores, you should pay attention to whether there are "100% anti-purple line", "UV400", "anti-ultraviolet" and other signs on the lens, tag or outer packaging of the sunglasses .
There are many colors of sunglasses lenses, blue, pink, yellow, black and gradient colors, etc., which can be described as gorgeous. Sunglasses can show different colors, mostly through dyeing, painting and other methods.
Dyeing refers to adding some chemicals to the lens during the manufacturing process to make the lens appear colorful to absorb light of a specific wavelength. It is also the most commonly used method in the manufacture of sunglasses. Coloring refers to applying color on the surface of the lens, which can be evenly painted or gradually painted.
Another way to change the color of the lens is to add silver halide to the lens so that the originally transparent and colorless lens can be turned into a colored lens when exposed to strong light outdoors.
It should be pointed out that the shade of the lens is not related to the protection of sunglasses. It is not that the darker the color, the stronger the UV protection. Whether it can prevent ultraviolet rays depends on the functional design of the lens itself, and the choice of color shades can vary from person to person.
Choose lenses with a relatively darker color when outdoors with strong sunlight, and choose lenses with a lighter color when driving. Generally, dark gray is better, dark brown and brown are the next best.
>>Can't wear sunglasses to watch the eclipse
June 21 this year is a special day. This day is both Father’s Day and the summer solstice. There was a "hand in hand" solar eclipse on the summer solstice. This is the most ornamental astronomical feast in China in the past decade. It can be seen that it has attracted hundreds of millions of people to take to the streets and scramble to witness. Some sunglasses manufacturers sell filter sunglasses, claiming to be able to observe solar eclipses, and they are sold out online and offline in a short time.
However, the real situation is that "the solar eclipse is refreshing for a while, and there are two lines of speechless tears" . After a period of time, a large number of "solar eclipse eye disease" patients shuttled between the hospital ophthalmology clinics.
>>Who is not suitable for wearing sunglasses
For people without eye diseases, wearing sunglasses is an active way to protect eyes. For patients with cataracts, keratitis, and dry eye, wearing sunglasses can reduce the irritation of light to the eyes and slow down the phenomenon of photophobia and tearing.
However, not everyone is suitable for wearing sunglasses, which is not suitable for the three types of patients with glaucoma, color blindness and night blindness.
Sunglasses generally do not have diopters, and people with myopia can choose to wear contact lenses before wearing ordinary sunglasses. For those who wear frame glasses, consider adding a pair of sunglasses clip to the frame, or adding a pair of glasses.
Of course, you can also choose color-changing lenses when equipped with myopia, which can also reduce the stimulation of strong light, protect the eyes, and prevent visual fatigue.
>>Do children need to wear sunglasses?
In view of the physiological characteristics of children's eyes, some experts pointed out that compared with adults, children's eyes are more susceptible to ultraviolet rays. Therefore , it is necessary to take eye protection measures for children when the sun is scorching .
However, not every age is suitable for children to wear sunglasses. Children between the ages of 0 and 3 are in the critical period of visual development. In order to develop visual function, infants and young children before the age of 3 need more bright light and clear image stimulation.
After wearing sunglasses, the light in the visual range will dim, and the pupils will be enlarged. The child’s eyes lack time to blend in with the normal light environment, and the macular area of the fundus cannot be effectively stimulated. The visual function may be affected. The person may even cause amblyopia. Therefore, before the child is 3 years old, parents are advised not to wear sunglasses for the child.
When the child is 3 years old, the situation is different. One is that the visual development has reached a relatively complete level; the other is that the time spent out has increased significantly, making it possible for children to be exposed to more ultraviolet rays outdoors. When children are in a strong light environment, such as snowy mountains, oceans, grasslands, and beaches, they need to wear a pair of regular, high-quality, UV-resistant sunglasses to reduce the irritation of strong sunlight to children's eyes and provide protection for their eyes.
However, it must be noted that the development of eyes and vision of children at about 6 years old is close to that of adults, and children under 6 years of age should wear sunglasses as little as possible. It is best to control the wearing time within 30 minutes each time, and the longest time should not exceed 2 hours. You should take off your sunglasses immediately after entering the room or in the shade.
>>Sunglasses also have a shelf life?
To choose a suitable pair of sunglasses, the following basic tips should be kept in mind:
UV protection : Choose sunglasses that can block 99%~100% UVA and UVB radiation.
Sunglasses size : buy large-size sunglasses. Too-sized sunglasses cover a wide range and help reduce the ultraviolet rays entering the eyes from the side.
Color choice : Don't be fooled by colors. Although different colors and dark lenses look cool, they won't block more UV rays.
Price is not the first place : the right is the best. Choose good quality sunglasses with 100% UV protection.
Don't forget the children : children are as vulnerable to sunlight as adults, and they need to develop the habit of wearing glasses when the sun is strong. But please choose sunglasses with quality certification from regular manufacturers, not toy sunglasses.
The choice of polarized lenses: Polarized lenses can block reflections and glare from smooth water surfaces, roads, car windows, etc., making driving and outdoor sports safer and more comfortable.
Selection method : The mirror surface is smooth, free of scratches and impurities, and the surface curvature should not be too large. Formal sunglasses should have a tag, indicating various production information in detail.
"Shelf life" : Sunglasses will degenerate and change with use, and the ability to resist ultraviolet rays will also decrease. Generally speaking, the "shelf life" of a pair of sunglasses is about 2 years.