However, experts specially reminded that sunglasses should not be worn for a long time. Sunglasses can make people's eyes in relatively dim light, and people's pupils will unconsciously expand. If people's eyes are in this state for a long time, even if the original vision is good, it will become worse in the future. Wearing sunglasses for a long time will also lead to narrowing of the anterior chamber angle of the eyes, which may lead to poor drainage of aqueous humor. After a long time, it is easy to induce acute attack of angle-closure glaucoma. Patients will have envy, eye pain, headache, sharp decline in vision, and even accompanied by nausea, vomiting and other systemic symptoms. Therefore, people suffering from color blindness, night blindness, glaucoma and optic retinitis should not wear sunglasses.
Question 2: When is it appropriate to wear sunglasses and when is it not suitable to be outdoors, whether to travel on the beach or have a spring outing on the lawn, climb mountains and ski, etc. In addition, driving is also suitable for wearing sunglasses.
Sunglasses are not suitable for indoor wear, nor for wearing in dark environment, because it will affect the brightness and make the eyes tired.
Question 3: When do you wear sunglasses? Sometimes the sun outside is too fierce. Under the scorching sun, if nearsighted drivers take off their optical glasses and put on sunglasses to avoid the damage of the sun, then the whole world will become blurred, not to mention driving ... If they don't wear sunglasses, the strong light from all directions will make their already hot and tired eyes even more uncomfortable, not to mention how their poor eyesight can bear such damage?
Whether nearsighted or not, many drivers want to wear a pair of glasses with anti-glare and anti-glare functions when driving, so that even if they drive in the sun for a long time, they will not feel eye fatigue; Or when driving at night is suddenly illuminated by strong light, it will not be dazzled and bury hidden dangers.
However, there are many brands of so-called "driver's glasses" or sunglasses, polarizers and additional mirrors on the market, and the prices range from ten yuan to several thousand yuan, which is very different. So, what kind of glasses should drivers choose?
When choosing driving glasses, some drivers like to wear dark sunglasses, thinking that it can better prevent strong light and ultraviolet rays. But in fact, if drivers wear sunglasses improperly, wearing sunglasses that are too dark and too big for a long time is likely to lead to a car accident.
According to relevant research data, the dark color of sunglasses will delay the time for eyes to send images to the brain, and this visual delay will cause speed perception distortion, which will make drivers wearing sunglasses make wrong judgments. Especially when driving a car or motorcycle at a speed of 80km/h, dark sunglasses will prolong the driver's reaction time to emergencies 100ms, resulting in an increase of 2.2m in the sudden braking distance. Experts believe that serious accidents often occur in this situation.
At the same time, although dark sunglasses have strong anti-glare ability, their light transmittance is poor. After wearing it, it will feel darker, you can't see clearly, and it is easy to form traffic hazards.
On the other hand, one of the purposes of wearing driving glasses is to avoid the harm of strong ultraviolet rays to the eyes, but in fact, it does not mean that the darker the sunglasses, the better the anti-ultraviolet function. Because the darker the lens, the bigger the pupil of the wearer, so if sunglasses do not have the function of filtering ultraviolet rays, ultraviolet rays will do more harm to the eyes.
Some cheap driving glasses are made of glass or other fragile materials, so that in the event of a traffic accident, airbags will crush the glasses and cause serious damage to the eyes.
So, what problems should be considered when buying driving glasses?
1, conditions for safe driving mirrors; It can be divided into day and night.
Shanghai National Glasses Glass Enamel Product Quality Supervision and Inspection Center is the authoritative organization for inspecting the quality of glasses in China. A staff member surnamed Sun told reporters that the light transmittance of driving glasses should not be lower than 8% during the day and higher than 75% at night, and there are different requirements for driving glasses during the day and at night. At present, many driving polarizers on the market belong to sunglasses, which are generally suitable for daytime use but not for night use. It should not cause parallax and color difference. High-quality driving glasses can not only weaken the projected strong light, but also keep the light neutral without parallax and color difference. "Parallax" refers to the distortion or deformation of objects when looking at the road with glasses, thus making a wrong judgment on the road surface. When the "color difference" is serious, it will be harmful because the traffic lights cannot be distinguished.
Sun, a professor and doctoral supervisor at the Institute of Ophthalmology, Beijing Tongren Hospital, believes that from a medical point of view, sunglasses and similar driving mirrors should first be able to prevent ultraviolet rays, which is the first thing to pay attention to when choosing. Protecting eyes from ultraviolet rays is the basic function that sunglasses must have. A pair of qualified sunglasses should be able to block ultraviolet rays and have strong resolution to traffic signals of different colors. However, at present, all kinds of sunglasses on the domestic market often do not explain whether they have a defensive effect on ultraviolet rays, which makes people doubt whether they can prevent ultraviolet rays.
The second function of the driving mirror is to prevent glare. There are two ways to prevent glare: one is through color. Dark color can filter a considerable degree of visible light and play an anti-glare role; One is to use a polarizer, which is available in the domestic market. It can prevent glare, but it is more expensive. The choice of color and material is also very particular. It should also be noted that the driving mirror should be able to filter short-wave light in visible light to a certain extent. Visible light is light with a wavelength between 400 nm and 700 nm, among which short-wave light, such as blue light and purple light, is the main light that hurts and interferes with eyes. Regular optical shops should ... >>
Question 4: Do you pay attention to the time and place when wearing sunglasses? Yes! Generally, sunglasses are decorative, and their main function is to protect the eyes from the sun!
Then, the most suitable occasions are outdoor in spring, summer and autumn, sunny morning and afternoon. Also match the corresponding style of clothing.
Don't wear glasses at the party, it seems inappropriate. If people can't see your eyes when talking to you, they will feel uncomfortable and impolite!
If it is a party with a special theme, the organizer agrees to wear it and can bring it!
There are also offices, classrooms, concerts, press conferences and other serious public places. Which ones are not suitable for wearing.
You can wear it at the funeral! Shopping and traveling can be worn!
It is not suitable to wear sunglasses in winter!
Question 5: When is it appropriate to wear sunglasses? In summer, whenever the sun comes out, it is suitable to wear sunglasses.
Question 6: When do you wear sunglasses? In fact, you can take it all year round, usually in summer and spring.
Question 7: When is it appropriate to wear glasses? You don't need to wear glasses when you use your eyes at close range, such as reading, writing and watching the computer. Don't use your eyes at close range for a long time, or you will easily get visual fatigue. Once the eyes are too tired, the vision will decline faster. When looking at the distance, such as looking at the blackboard and watching the slide show, you'd better wear glasses, because you can't see clearly, but you are still trying to see, and your eyes are adjusted with difficulty, which leads to excessive fatigue and decreased vision. You can do eye exercises at ordinary times, which has a good effect on preventing vision deepening! Closing your eyes is helpful to your eyes, but you should pay attention to eye hygiene and habits! But above 200 degrees, it is best to wear it often, which will help prevent the development of myopia. I have seven steps to prevent myopia, you can try it, and you can also do it in the ophthalmology department of children's hospital. I hope it helps you!
Question 8: When is it appropriate to wear sunglasses with reflective front? You can wear it when the ultraviolet intensity is high. It can also be used for wind protection at ordinary times. It's quite popular now. It's very UV-proof.
Question 9: Is it appropriate to wear sunglasses when eating? If you eat by yourself, look at you with or without sunglasses. If you are eating with your elders, you'd better take off your sunglasses, which is a respect for your elders. If you are a movie star or think you are a star, it is normal to eat with sunglasses, but it is not normal not to wear sunglasses.