Aside from insomnia, the light emitted by these smartphones and tablets are seriously dangerous for our eyes. Especially, when you use your smartphones with lights turned off for hours, electron beam shine directly into our eyes which will make conjunctival become prolonged dry that can seriously damage our eyes.
This 40 year old man developed eye cancer from using his smartphone for numerous times with the lights turned off before sleeping. Unfortunately experts can't do anything about him because of the extreme difficulty of retina replacement surgery at the current state of development of medicine.
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