Researchers at Photoprotective Technologies (PPT) have developed a rating system for assessing the ability of computer glasses to ensure the production of melatonin.
Blue light emitted from computers and other electronic devices disrupts melatonin production and therefore can affect the quality of sleep. The “Melatonin Production Factor” (MPF) rates the ability of eyewear to reduce the blue light that may contribute to sleep loss.
Dr Jim Gallas, co-inventor of the rating system and CEO of Photoprotective Technologies, compares the MPF to the well-known SPF for skin damage. “The MPF allows consumers to make informed decisions about what computer eyewear works best for them,” Gallas says in a release. “For example, a computer lens with an MPF of 6 means that the iPad you stare at for 90 minutes at night is like staring at the same iPad for 15 minutes without the eyewear.”
-See more at: http://www.sleepreviewmag.com