Doc. Sparrow who is the ophthalmologic doctor in Columbia University's branch medical center said most people shouldn't were blue glasses online no matter how old you are. Doctor Sparrow is investigating that if it will cause macular degeneration when eyes contact the blue light in the sunlight. This degeneration is the main cause that leads the blindness of the elderly. She believes that as age increased, a number of retinal cells in the photosensitive compounds will be more and more. While some wavelengths of blue light in spectrum, to the greatest extent, will activate these compounds, promoting the release of harmful free radical, It threatens the health of eyes as damage the hyperoxidation of retina cells.
Blue colored sunglasses really harm eyes. On one hand, blue light has short wavelength, so in the blue light, human eyes has the smallest ken and can not see things clearly. On the other hand, blue is the color closest to UV, which is also detrimental to the optic nerve and easily causing injury to the eye. Many opticus diseases are proved to be related with the blue ray clinically.
In addition to the glasses with blue lenses, the currently popular colorful contact lenses with blue stripes are also harmful to eye health. When choosing them, people should take care. So what color of prescription eyeglasses is safe for us to buy? Professor Sparrow said, yellow or brown sunglasses are the best. Human eyes' retinula cells are most sensitive to yellow as it has moderate wavelength, and can make things in nature seen more clearly. Moreover, yellow sunglass can also filter blue light, and then decrease the number of blue light. So it can protect eyes' health effectively. Besides, black lens are also a good choice as they can protect eyes from all colorful rays.
At last, Doctor Sparrow advises customers that there are good and bad glassed mixed up, many glasses quality donot pass the test. When you coose sports eyeglasses, you'd better choose the one which has the function of defending ultraviolet light, and the index is usually between 96% to 98%. Don’t choose to dark color lenses because their transmittancy is low. It will make pupils dilate, which harm eyes.
