Risks of modern light sources
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. In contrast, the modern mercury light
sources must be viewed much more critically.Mercury light
sources can be found in the backlight of TFT flat-screens
(notebooks and computers) as well as in TFT television
screens, energy saving lamps and fluorescent tubes. The
biggest strain to the eye is caused by TFT screens which
people sit in front of for many hours, daily, during their
working life. In addition to the radiation load coming
from the screen, the fluorescent lighting at the workplaces
contributes to this negative effect.
Mercury light in TFT screens
Flat-screens use mercury light as a backlight. This light
is, as in the case of fluorescent tubes, produced by gas
discharge. While the spectrum of the white daylight is
composed of a harmonic proportion of colours, fluorescent
lamps do not. TFT screens radiating mercury light have
a discontinuous spectrum. The latter shows high unnatural
short-wave peaks of blue (blue, indigo, violet) with pointed
"energy highs". However the red area, which
is responsible for promoting blood circulation, shows
low energy (see graph).
Spectrum
of the Daylight and the discharge lamp
A danger to the retina?
A person doing on-screen work looks directly into the
source of light for a long time. This means that the radiation
hits - unfiltered and bundled - the spot of the sharpest
vision, the so-called macula lutea, also called the “yellow
spot” which is located on the back wall of the eyeball.
The eyes lens filters ultraviolet light but does not filter
blue light adequately. This proportion of blue light 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. Under the influence
of blue light, free radicals are produced, damaging cell
metabolism in the eye.
Blue light impedes vision
Blue light breaks up more easily than red light. It is
focused on different levels 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.
Graph -
eye lens
Disorder of hormonal balance
Due to its high proportion of blue light, mercury light
also affects the hormonal balance in a negative way by
reducing the production of melatonin and boosting the
generation of the stress hormones cortisol and ACTH. Disorders
of the hormonal balance can lead to illnesses common in
western civilizations such as cardiovascular diseases,
metabolic disorders as well as disorders of the immune
system, cancer, diabetes etc.
No chance for regeneration
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 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 leading to
long term problems.
Brightness control offers
no protection
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. As the light impulse always penetrates the
body tissues to an equally deep level, it does so even
when the e ye perceives a lower brightness caused by frequency
modulation. Pulsating signals can disturb the biological
balance even more than permanent signals. TFT screens
only cease to flicker when turned on fully. That is why
it is recommendable to turn the screens on fully and wear
special Computer Glasses.
Protect your eyesight!
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 orthodox medicine although the above-mentioned damaging
mechanisms have already been proven in cell experiments.
Who wants to wait until –maybe many years from now
- orthodox medicine research delivers the final proof?
If you already want to protect yourself today, we recommend
you to wear PRiSMA® Computer Protection Glasses as
a precaution.
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For more information PRiSMA® Computer
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www.barbarajonestherapies.com
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