A common admonition from parents and grandparents, based simply on intuition, but now backed by science.
“Blue light” — the type emitted by computers, cell phone displays, and fluorescent and LED lights— is a part of the ultraviolet light spectrum and consists of shorter wavelengths of visible light with high energy and thus high absorption rates by the retina.
As we spend more and more time focusing on television screens, mobile phones, and computer screens, the incidence of complaints of digital eye strain have also increased. Headaches, watery or conversely, dry eyes, difficulty focusing and an altered circadian rhythm with resultant disruption of sleep patterns are all possible manifestations of prolonged accumulated exposure.
Macular degeneration is heralded initially by some form of mild visual impairment that can progress to more severe impairment or loss of vision.
For different prcatical reasons it may not be possible to avoid long hours of exposure to blue light, but certain steps can be taken to reduce the overrall effect.
Read more here: Macular degeneration is occurring earlier
Culled from Ophthalmology Times