Numerous neuron research had evidently illustrated that blue light and ultra-violet from LED screen of all electronic devices, such as smartphone, tablets, computer display, television, etc. For years now, professionals in the fields of light energy and vision have known about the hazards ultraviolet (UV) light presents to ocular health. We are gradually having longer and more intense exposures to blue light; much of the world of commercial display and industry is lit with cool white fluorescent tubes which emit a strong spike of light in the blue and ultraviolet ranges. Indeed many homes and offices are lit with cool white fluorescent tubes. No one doubts more people are spending time in front of video display terminals (VDTs) which produce blue light. While some people find blue light irritates their eyes or causes headache, most are able to ignore it. Scientists only now are beginning to investigate its long term effects and offer some solutions for maintaining ocular health in the presence of blue light. Experts differ as to the exact wavelength of UV light waves, but generally speaking, UV light is defined as that part of the invisible spectrum which ranges from 420nm to 200nm. (Nm stands for nanometer which is one billionth of a meter.) This part of the spectrum is divided into UV-A, (379nm to 315nm), UV-B, (314nm to 280nm,), UV-C (279 to 200nm.) and UVt-MAX (380nm to 420nm), which penetrates through lens and causes direct damage to retina.
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