Not everyone knows that not all sunglasses are suitable for wearing during driving and some will affect colors, visibility and definition.
In our discussions about the sunglasses to be purchased for use in driving, the following are the factors that need to be considered:
Model of frame:
A fashionable frame does not necessarily suit the requirements for professional safe driving. When we select the model of sunglasses suitable for use in driving, the frames we need are those that do not interfere with the visual field. We recommend the frames with an appearance that is flat and slender legs.
Color of lenses
The color of lenses has an effect on the number of visual light that can reach the eyes, a driver’s judgment on colors and visual contrast. Therefore, a wrong lens color goes against a driver’s judgment on traffic signs and lights and is easy to distract a driver.
Research results show that sunglasses with the three colors of pink, blue and green should be prohibited for wearing in driving, unless they bear the safety mark, for they very much make against drivers in seeing the red light. The difference is huge also for the same color with different dyeing degrees.
The colors of the sunglass lenses most appropriate for use in driving are grey and brown, for they are neutral colors. The use of them in seeing things will not change the original color of an object. Many sunglasses designed for drivers will also use yellow and amber lenses, for the two colors can enhance visual contrast and definition.
Whatever lens color you choose (subject to safety), the color depth of lenses is another factor that needs key consideration. Color depth is divided into 0-4 levels, which are normally described on the lenses you purchase and finally decide the number of rays that reach the eyes. According to laws, all sunglasses should be marked for density numbers. The sunglasses at 4th level should be prohibited for being used in driving; the lenses at 0 level can really play a role when they are worn in an overcast environment or nighttime driving; the lenses at 3rd level are normally unsuitable for use in overcast or nighttime driving.
Lenses of fixed dyeing vs. photochromic dyed lenses
Many people like to wear photochromic dyed lenses, which have a variable dyeing degree that changes with UV exposure. Photochromic lenses are inappropriate for wearing in a car, for the windshield of most vehicles can fend off as high as 40% ultraviolet light and slow down the speed of change in the dyeing degree of photochromic lenses.
Given the adverse factors of photochromic lenses, the lenses of fixed dyeing are undoubtedly more appropriate for use as lenses in driving. They are immune to ultraviolet irradiation and available in common, gradient and polarized models.
Polarized lenses are a very common choice, for they can drastically reduce the glare reflected from wetland. Glare will bring great presure to eyes and seriously distract drivers. Polarized sunglasses are also suitable for use in foggy weather, for they can highlight the contour of objects.
Gradient lenses have an appropriate dyeing degree and are relatively suitable for use in driving. Some drivers prefer gradient lenses, for the color is shallow toward the bottom of the lenses to enable a clear view of the dash board. Meanwhile, the color is deeper toward the top of the lenses, thus ensuring visual definition in an environment illuminated by strong light.
Appropriate lens film ensures visual definition during driving and has extended the service life of the lenses.
The antireflective film can eliminate the reflections on lens surface and has enhance light penetrability so that you can have a clearer visual field all day long. Additionally, the film can effectively dispers water and grease to help you keep your spectacles clean.
Some spectacles manufacturers will affix a patented anti-glare film onto the sunglasses and polarized lenses the make for use in driving.