Low vision, multiple disabilities, visual impairment and CVI / BVD

For trainers, teachers, and parents doing visual training for CVI children or clients, please read about the following explanation on near ultraviolet 'blue light' emitted from LED lights. LED lights are widely used in torches, Christmas decoration lights, festival lights, bicycle lights, not to say lamps, ipads, computer screens, smartphone screens... The near UV blue light emitted from LED lights are doing harm to human eyes especially at close distance and for long duration. So please use them with great caution for your own eyes and your students' or children's eyes. What is LED ?  Its disadvantages, problems, and effects on human beings LED is the most recommended light source nowadays. Apart from light bulbs, it is also used in the background light of electronic display screens, such as your smartphone 1  and computer monitors/screens 1 , etc. As LED is not too hot and energy saving, it is greatly promoted and is used to replace other more traditiona...

Chinese article:  https://lowvisionandcvi.blogspot.com/2018/02/ledipadled_38.html LED is the most recommended light source nowadays. Apart from light bulbs, it is also used in the background light of electronic display screens, such as your smartphone 1   and computer monitors/screens 1 , etc. As LED is not too hot and energy saving, it is greatly promoted and is used to replace other more traditional light sources, such as fluorescent tubes, curlicue compact fluorescent light bulbs, and incandescent light bulbs. However, it is exactly because LED lights produce a fair amount of light in the blue spectrum 4   (or called ‘blue light’), that they are so bright! There is no free lunch in this world; we may be paying a price 4  to use LED. According to a research paper called ‘The Effects of Blue Light On Ocular Health’   5 , written by Elaine Kitchel of the American Printing House for the Blind, the wavelength of blue lig...