Bluelightprotect - Why?
- Risks of modern light sources
- Mercury light in TFT screens
- Spectrum of the daylight and the discharge lamp
- A danger to the retina?
- Blue light impedes vision
- Graph - eye lens
- Disorder of hormonal balance
- No chance for regeneration
- Brightness control offers no protection
- Protect your eyesight!
Due to their high proportion of red in the near infrared and long-wave range, the “good old light bulbs” are easy-on-the-eye, and stimulate regeneration. In contrast to that the modern energy-efficient light sources must be regarded much more critically, as they contain a large amount of blue light frequencies.
Light sources with a heavy load of blue light components can be found in the backlight of LED flatscreens (notebooks and computers) as well as in flat screen TVs, energy saving lamps and fluorescent tubes. The biggest strain to the eye is caused by computer screens in front of which people spend many hours every day during their working life. In addition to the radiation load coming from the screen the fluorescent lighting often used in workplaces contributes to this negative effect.
Flat screens today use LED light as a backlight. While the spectrum daylight is composed in relatively even and harmonious color ratio, LED light has an extremely high proportion of blue with high energy and very low proportions of the circulation-stimulating and regenerating red range (see chart).
When working on a screen, one looks directly into the source of light for a long time.This means that the radiation hits the spot of the sharpest vision,unfiltered and bundeled. This macula lutea, also called the “yellow spot” is located on the back wall of the eyeball, the retina. The eye´s lens filters ultraviolet light, but not the visible blue light. The high proportion of blue light in LED lights can, in the long term, lead to damage such as age-related macular degeneration (AMD), an incurable disease of the yellow spot. Numerous scientific studies on AMD have proven that blue light can be harmful to the eye because it creates oxygen radicals damaging the cell metabolism in the eye.
Blue light breaks more easily than red light. It is focussed on a different level in the eye than long-wave light, which results in chromatic aberrations and blurredness. This is why pilots and athletes often wear yellow glasses, which filter the proportion of blue light, thus heightening visual acuity and contrast perception. Often AMD patients also get prescriptions for yellow glasses or lenses in order to protect their macula from destructive blue light.
Due to its high proportion of blue light, mercury and LED light also affects the hormonal balance in a negative way by reducing the production of melatonin (sleep hormone) and boosting the generation of stress hormones, like cortisol and ACTH. Disorders of the hormonal balance can lead to so-called lifestyle diseases such as cardiovascular disease, metabolic disorders as well as disorders of the immune system, cancer, diabetes etc.
Near infrared light is able to activate cytochrome oxidase, an important enzyme for the functioning of the mitochondria and therefore promotes wound healing and repairs tissue damages on a cellular scale. If one spends the biggest part of the day in mercury and LED light and looks into computer screens for a long time, the eyes get an overload of short-wave blue light. As this light lacks the proportions of red and infrared light responsible for enhancing blood circulation, the regeneration can often be insufficient.
The brightness control of a screen works through pulse width modulation regulating the on-time of the source of light in a certain frequency. Even when reducing the brightness of the screen the pauses between the impulses indeed become longer, but the power of the impulses is not reduced. Therefore the light impulse always penetrates the body tissues to an equally deep level, even when the eye perceives a lower brightness caused by frequency modulation. Pulsating signals can disturb the biological balance even more than permanent signals. Most LED screens only cease to flicker when turned on fully. That is why it is recommendable to turn the screen to full brightness and wear special bluelightprotect glasses from PRiSMA®.
In order to protect eyes from mechanical and chemical danger it is necessary and normal to wear protection glasses. But the danger caused by unprotected work at screens and under fluorescent lamps is often played down or denied by conventional academic medicine although the above-mentioned damaging mechanisms have already been proven in cell experiments. Who wants to wait until – maybe in many years time - classical medical research delivers the final proof? If you already want to protect yourself today, we recommend you to wear PRiSMA® bluelightprotect glasses as a precaution.