Ways to Select Best Colors for Sunglasses
7月 26th, 2010 by hannibalDr. Sparrow, a Professor of Ophthalmology of Columbia University Medical Center, said most people should not wear Blue reading glasses whether young or old. Dr. Sparrow is studying whether it will give rise to macular degeneration after human eyes contact with the blue ray in sunlight. This degenerative eye disease is also the main cause of blindness in the elderly. She believes that as age increased, the photosensitive compounds in some retinal cells will be more and more. While in the spectrum, the wavelength of the blue light can stimulate these compounds to the greatest extend and thus facilitate the release of the bad free radicels. Like the oxidative process that causes damages to retinal cells, it threatens eye health.
Blue-colored sunglasses are indeed harmful to the eyes. On one side, the wave length of blue light is short, and the viewwidth of blue light is the least, people cannot see clearly. On the other side, blue light is approach to the color of ultraviolet, just like ultraviolet, blue light is bad for nervus opticus and can damage eyes easily. Clinically, a number of optic nerve diseases have been confirmed with the blue light.
In addition to the blue lens glasses, the current popular colored contact lenses with blue stripes are also hazardous to eye health, so in the choice of them, people must be cautious. So, which color is safe when we are buying eyeglasses frames? Doctor Sparrow expresses that yellow or brown glasses is the best. Because yellow lights have medium length, which lead the visual cells of human eyes be most sensitive to yellow and make the natural scenery be seen more clearly. Moreover, yellow sunglasses can filter blue light, reducing its amount into people’s eyes, so as to effectively protect the eye health. Apart from yellow and brown lens, black lens is also a good choice because it lessens the contact with lights of all colors.
Finally, the professor reminds consumers that the sunglasses now on the market are mixed, and many do not pass the quality standard of glasses. We should choose UV capabilities when we choose glasses frames, and the anti-UV index is usually between 96%-98%. The color should not be too deep, because there would be a serious decline in light transmission in these lens. This makes eye pupil in the dark powder so great that will harm the eyes.