In the previous article, we discussed “What is the best way to clean polarized sunglasses?”. In this article, let’s talk about “Sunglasses, Traffic Signals, and Color Vision Deficiencies”.
Choose sunglasses carefully
According to reports, sunglasses can be divided into sun-shading mirrors, light-colored sunglasses, and special-purpose sunglasses according to different uses. According to the transmittance category, it can be divided into category 1, category 2, category 3, and category 4. Different classifications have different uses and transmittances in the visible spectral range. If the transmittance is too large, it means that there is too much light passing through, the blocking effect on the sunlight is small, and it cannot protect the eyes. If the transmittance is too small, it means that the transmitted light is too weak, blocking too much sunlight, causing blurred vision, inability to see objects in front, and easy to cause accidents.
Wearing sunglasses can’t recognize traffic lights
Spectacle experts say that the traffic signal projection ratio refers to the spectral transmittance of the lens weighted by the CIE (1931) standard color observer's photopic spectral efficiency and the relative spectral power distribution of the standard illuminator A light source and the corresponding traffic signal color filter ( Red, yellow, green) spectral transmittance function. This project reflects the ability to recognize traffic lights after wearing sunglasses. Failing this project will cause obstacles when the wearer recognizes the traffic signal, or fail to recognize the traffic signal, which will bring safety hazards to the traffic safety and the wearer itself.
Recommendations for choosing sunglasses
Buy sunglasses with complete logos. Try to choose sunglasses with polarized lenses. Good polarized sunglasses can block more than 99% of ultraviolet rays. Consumers can choose polarized sunglasses with the 'UV400' mark.
Choice of sunglasses color
Regarding the choice of sunglasses color, it is recommended to observe red, green, yellow, and other colored objects before wearing sunglasses. Then put on sunglasses and observe the same object. The colors observed twice should not have a large color difference, otherwise, it will reduce the ability to identify traffic lights. For sunglasses with colored lenses, especially brightly colored sunglasses, such as sunglasses with orange, green, and blue mirrors, special attention should be paid to the identification.
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