Optometrist said that how to choose lenes' color should wear it then the color of surrounding environment is undistorted, sharp edges of objects are chear and can recognize different color's lights. The medium colors are usually better, such as gray, sandy and pea green and the ray ban aviator sunglasses of such colors can greatly absorb infrared ray and ultraviolet ray. While drivers had better wear polarized sunglasses, because these glasses can weaken dazzling glare.
The choice of color is very important, many people will prefer to their favorite colors and thus neglect health. Doctor Janet Sparrow, an ophthalmology professor in the subordinate medical center of the American Columbia University, says that most people should not wear blue sunglasses regardless of their ages. Dr. Sparrow is studying that after contacting sunlight in blue, whether it can cause macular degeneration, which is the main cause of the old blindness She thinks that as the age growing, photoallergy compound in retina cells will become more and more, while the wave length of blue light in the spectrum can active these compounds at a largest degree. Thus promote the harmful free radicals to release and threat the health of the eyes just like the oxidation process which damage to the retinal cells.
Other professors say that blue ray ban sunglasses will actually cause a health hazard to eyes. This is because, on the one hand, the wavelength of blue ray is short, so human visual field in blue light is minimum, and people can not see things clear. On the other hand, blue is the closest color to ultraviolet rays. Like ultraviolet rays, it is a damage to optic nerve and easy to cause injury to people's eyes. In clinic, many diseases about optic nerve are proved to be connected with blue light. Apart from the glasses of blue tinted lenses, color contact lenses with blue stripes which are popular in the present market will also damage to the eye health, so peop So which is the safe colors for sunglasses? Professors of ophthalmology point out that the yellow or brown sunglasses are the best choice.
Since the yellow lights possess moderate wave length, so that the photoreceptor cells of human eyes are most sensitive to yellow and make a much clearer image of the natural scene. Besides, yellow sunglasses can filter blue light and reduce the amount of blue light into eyes and it can effectively protect the health of the eyes. In addition to yellow lens or brown lens, the black lens is a good choice because it can reduce the conta At last, doctor Sparrow warned consumers that good and bad sunglasses are mixed up in the market and most of them have bad quality. He emphasized that a pair of good sunglasses should offset ultraviolet instead of darkening visible light. Therefore, when selecting ray ban warrior sunglasses, we should check its function of preventing ultraviolet (ultraviolet index are usually over 99%) on one hand. On the other hand, you'd better not choose lenses with deep color, whose transmittance will have a severe downturn to dilate pupils in dark, and the same number of ultraviolet rays will filter in to damage eyes.
