Most light sources emit blue light, including smartphones, Tablets, incandescent lamps, fluorescent lamps, LCD and LEDs, found in ambient lighting systems and digital devices such as monitors PC, TV monitor.
The consequence of this consists of the alteration of the ocular surface, responsible for symptoms such as dry eyes, heaviness, itching and burning) already present in subjects exposed to the use of video terminals for more than 6/8 hours a day using lenses of poor optical quality and without protective filters (the so-called video terminal stress syndrome).
A possible interference with retinal metabolism after radiation exposure was also highlighted. Furthermore, other studies have hypothesized an interference on the sleep cycle in subjects exposed to blue light.
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