Due to low visibility, glare of oncoming lights, fatigue and other factors, the accident rate of driving at night is 5- 10 times higher than that of daytime, and 80% of major traffic accidents occur at night. Driving safety at night has always been a problem that people pay attention to and try their best to solve. In order to shine brighter and see wider and farther, the headlights have changed from ordinary lights to hernia headlights, and steering auxiliary lighting has been installed, with follow-up steering. However, the high brightness of the car lamp makes the glare of the car lamp more serious, and the human eye is more prone to fatigue. In order to solve the problem of strong light, people are constantly innovating, among which anti-glare and anti-glare facilities mainly include: light blocking plate or dimming strip and anti-glare and anti-glare glasses. However, due to the installation of the light shield and dimming bar on the car body, the driver can't keep up with his eyes when the car keeps shaking, and the driver is prone to headache and dizziness, so he is quickly eliminated. Therefore, anti-glare and anti-glare glasses have become the object of research.
In this case, 1996 (patent number 96 1 15703.8) accepted the first patent of anti-glare glasses in China. Since then, all kinds of glasses have appeared. The glasses on the market now mainly include: sunglasses and polarizers; Fast color changer; Glasses that use or imitate the first-generation patented technology have just come out with the second-generation technology. So what are the advantages and disadvantages of various glasses, and how should we compare and choose them?
First of all, let's be clear: the purpose of blocking strong light is to see more clearly. If the field of vision becomes smaller or darker, it will be "counterproductive." Wearing glasses in the cab is not for looking good, but for being more comfortable.
From the practical requirements of driving glasses at night, these glasses should enlarge and brighten the field of vision, so that you can see more clearly; On the other hand, driving the rearview mirror at night must be able to solve the existing practical problem: reducing the glare of oncoming cars without darkening the normal field of vision. It seems that this is a contradiction, and it is not easy to solve it effectively.
Let's analyze the advantages and disadvantages of several night driving mirrors from these two aspects:
1, sunglasses, dark brown glasses, gray glasses, polarizers: these glasses are suitable for high brightness during the day, not at night. The function is to weaken the light in the field of vision as a whole and darken the whole field of vision. Although it has played a role in weakening strong light, it also makes the areas that should be seen clearly unclear. (the national standard requires that the transmittance of night driving glasses must be >; 75%, no matter what color polarizer, the limit of its transmittance is 50%. Other mirrors are shaded by trees. ) leading to an increase in the accident rate. (Remember: if the transmittance is less than 75%, the human eye must adjust the ciliary muscle to enlarge the pupil in order to obtain normal light energy when observing the road surface. Adjusting ciliary muscles for a long time will cause eye fatigue and cause traffic accidents. Therefore, anti-glare products must ensure that the light transmittance is ≥75% while preventing glare, otherwise they are not allowed to go on the market, and you can ask manufacturers and sellers to bear legal responsibilities.
2. Color changing mirror: There are some color changing mirrors on the market now. However, no matter how fast it changes, it is only a matter of time. Eventually, the glasses will become sunglasses, and the whole field of vision seen through the lens will be darkened. The result of wearing sunglasses at night is that you can't see clearly beyond 15 meters. But if the speed of a car is 60km/h, it will reach 16.6m per second. If you can't see anything beyond 15m, it depends on the "effective braking distance" of your car before you react. Generally speaking, if 1s responds in advance, the accident mortality will drop by more than 80%. It can be seen that the color change mirror is that you have lost this 80% reaction time. There is no chance for the color change mirror to change back in the continuous traffic.
3. Color gradient glasses: one is glasses with dark upper part and bright or colorless lower part; The other is glasses with gradual color change, that is, the lens gradually darkens from bottom to top, or the upper part is dark and the lower part is bright. Although these two glasses can reduce glare, they can't see the road clearly because the upper part darkens the whole distant field of vision. After wearing this mirror, you should keep looking up and down, otherwise you can't reduce glare or see the distance clearly. People will soon be sour if they don't feel dizzy. Similarly, this kind of glasses will soon cause dizziness when the car is constantly bumping.
4. Glasses that use or imitate the patented technology of 1996: 1996 The first generation technology is immature. This technology is designed as an unreasonable box in the upper left corner because the dimming area is too large and the graphic design is too large. In practical application, it has the disadvantage of blocking the front and rear left and right sight lines, and it is easy to get dizzy and headache after long-term wear. Many similar glasses on the market now have the same principle and shortcomings (there is a whole model now).
5. The newly released second-generation technical glasses: the latest generation technology (patent number 2009200 19294) was found on the website of China Intellectual Property Office. It belongs to the technical upgrade in 1996, which improves the product and solves the defects of the first generation: it does not block the front view, does not block the left view, and does not have a headache when worn for a long time. Special product design and special manufacturing technology enable products to achieve: softening strong light, while brightening and expanding vision.
Based on the above comparative analysis, the effect of night driving mirror should belong to the latest second-generation technical products, which are closest to the solution of practical problems and have no side effects, and belong to products that can be applied in real life.