Source: jinling evening news 2018-12-28

It is reported that sunglasses can be divided into sunshade, light-colored sunglasses and special-purpose sunglasses according to their different USES. According to the transmission ratio, it can be divided into 1, 2, 3 and 4 categories. The purpose and transmission ratio of visible spectrum range are different with different classification.

Scorching sun is phlogistic, star must wear pair of sunglass. The nanjing bureau of quality supervision and administration released the results of spot check and inspection on sunglasses products sold in various eyewear stores and mainstream e-commerce stores in nanjing. It is reported that 60 batches of samples were sampled, including 30 batches of adult sunglasses and 30 batches of children's sunglasses. After inspection, 44 batches passed and 16 batches failed, with a total passing rate of 73.3%; Among them, 4 batches of adult sunglasses failed, qualification rate of 86.7%, 12 batches of children sunglasses failed, qualification rate of 60%. The main unqualified items are visible spectral range transmission ratio, traffic signal transmission ratio and signs.

Choose sunglasses carefully

It is reported, sunglass differs according to utility, can divide sunshade lens, light color sunglass and special utility sunglass; According to the transmission ratio, it can be divided into 1, 2, 3 and 4 categories. The purpose and transmission ratio of visible spectrum range are different with different classification.

If the transmission ratio is too large, it means that too much light passes through, which has little shielding effect on sunlight (range of visible light) and cannot protect the eyes. The transmission ratio is too small, indicating that the light through is too weak, blocking too much sunlight (the range of visible light), resulting in blurred vision, unable to see the object in front, easy to cause an accident.

Wearing sunglasses can't recognize traffic lights

Experts say that the traffic signal projection ratio refers to the spectral transmission ratio of the lens weighted CIE (1931) standard color observer of the light visual spectral efficiency and the standard illuminator A light source of the relative spectral power distribution and the corresponding traffic signal filter (red, yellow, green) spectral transmission ratio function. The project reflects the ability to identify traffic lights after wearing sunglasses.

Failure to pass the project will cause obstacles for the wearer to identify traffic lights or fail to identify traffic signals, which will bring safety risks to the traffic safety and the wearer.

Consumer advice, try to buy polarized sunglasses

Expert reminds: buy the sunglass with all ready mark, choose the sunglass of polarization lens as far as possible, lens of good polarization sunglass can block 99% above ultraviolet ray, consumer can choose to contain "UV400" the polarization sunglass of protective mark.

As for the choice of the color of sunglasses, it is suggested to observe objects of red, green and yellow before wearing sunglasses, and then put on sunglasses to observe the same object. The color observed twice should not have a big color difference, or it will reduce the ability to identify traffic lights. Special attention should be paid to the identification of sunglasses with colored lenses, especially those with bright colors, such as those with orange, green or blue mirrors as the front label.

It is worth noting that experts suggest to buy polarized lenses for children's sunglasses, uv protection effect is good, and impact resistance is also very good, children's eyes have a certain protective effect.

Not even ultraviolet light

Did you choose the right shade for your car?

Hot days, many car owners will be equipped with shading film, jiangsu provincial bureau of quality supervision and inspection of automobile glass shading film product quality supervision and inspection results. The reporter learns, spot check product in all this 30 batches, eligible 23 batches, qualified rate is 76.7%.

The primary purpose of the shading film is, of course, to protect against heat and uv rays, but in substandard products, the four main indicators affect heat insulation and safe driving. According to experts, the visible light transmission ratio represents the percentage of the incident sunlight that directly penetrates the coated glass. The standard stipulates that the visible light transmission ratio should be 78%. In this spot check, it was found that the measured value of visible light transmission ratio of 3 batches of products was < 78%, which would affect drivers' observation of the driving environment and reduce their ability to recognize things outside the window.

In addition, the ultraviolet transmission ratio refers to the ratio between the transmitted ultraviolet spectral radiation flux and the incident ultraviolet spectral radiation flux. The standard stipulates that the transmission ratio of ultraviolet ray should be 1%. This random inspection found that the ultraviolet ray transmission ratio of 5 batches of products is unqualified, which will make part of ultraviolet ray be stored in the form of absorption and radiation and penetrate the shading film, resulting in the fast attenuation, fading and blurry optical properties of the shading film and greatly shorten the service life of the shading film.

Quality expert suggests, high grade film should be able to see the article beyond 6 meters clearly in the night, and inferior film can have foggy sense. Can use alcohol or gasoline to wipe the surface of the film, easy to fade is inferior film. Still have a small method, the glass that is sticking film of car stick film to be put on iodine tungsten lamp, what cannot feel heat with the hand is high grade film, and those who have hot feeling immediately shows its adiabatic performance has a problem, it is inferior film.