Blue-light hazard is defined as the potential for a photochemical induced retinal injury resulting from electromagnetic radiation exposure at wavelengths primarily between 400–500 nm. This has not been shown to occur in humans, only inconclusively in some rodent, primate and in vitro studies.The mechanisms for photochemical induced retinal injury are caused by the absorption of light by photoreceptors in the eye. Under normal conditions when light hits a photoreceptor, the cell bleaches and becomes useless until it has recovered through a metabolic process called the visual cycle.
(From Wikipedia, the free encyclopedia)
Blue light retinal injury
Blue light contributes about 90% of the risk of photochemical retinal damage from fluorescent lamps and sunlight, which is why the term "blue light hazard" is used to describe this risk. When blue light is absorbed by retinal tissue it induces oxidative stress and the causes the formation of indigestible debris which accumulates in the outer retina. The cumulative effect of chronic, sub-lethal oxidative retinal stress and the accumulation of oxidative debris in the outer retina contributes to the development of AMD.
What is the macular?
The macular is an oval-shaped pigmented area near the center of the retina of the human eye. It has a diameter of around 5.5mm. The macular is responsible for focusing central vision in the eye, and it controls our ability to read, drive a car, recognize faces or colors, and see objects in fine detail.
Macular degeneration is not curable
In ophthalmology, blue light is a high-frequency light in the violet/blue band from 400nm to 500nm in the visible spectrum. Frequent exposure to it can easily cause macular degeneration, which cause permanent damages that can potentially leas to blindness. UV rays, which range from 300nm to 400nm, are the leading cause of eye maladies such as cataract.
Medical studies prove that blue light to increased risk for cancer
Study after study has linked working the night shift and exposure to light at night to several types of cancer (breast, prostate), diabetes, heart disease, and obesity. It's not exactly clear why nighttime light exposure seems to be so bad for us. But we do know that exposure to light suppresses the secretion of melatonin, a hormone that influences circadian rhythms, and there's some experimental evidence (it's very preliminary) that lower melatonin levels might explain the association with cancer.
Even dim light can interfere with a person's circadian rhythm and melatonin secretion. A mere eight lux - a level of brightness exceeded by most table lamps and about twice that of a night light—has an effect, notes Stephen Lockley, a Harvard sleep researcher. Light at night is part of the reason so many people don't get enough sleep, says Lockley, and researchers have linked short sleep to increased risk for depression, as well as diabetes and cardiovascular problems.
Studies prove that blue light might cause insomnia and disrupt biological clock
Study done by researchers at Harvard University indicates that using smart phones, tablets, or laptops prior to going to sleep throws the body's biological clock, the circadian rhythm, out of rhythm. As a result not only does sleep quality suffer but research also shows that it may contribute to the causation of cancer, diabetes, heart disease, and obesity. Exposure to light suppresses the secretion of melatonin, a hormone that influences circadian rhythms. There is experimental evidence the lower melatonin levels might explain the association with cancer.
Professor Richard Funk, a Famous German ophthalmologist, had his report Blue light can Seriously Threaten Retinal Neurons published by the European Journal of Neuroscience in August 2011. The report pointed out that continuous exposure of blue light, especially the light of LED lamps, smart phones, and computer screens, which contain large amounts of high-energy shortwave blue light with irregular frequencies will cause vision problems.screens are now becoming the number one source of blue light.