Avoid using LED lights and screens/monitors for visual training
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