A new research has demanded that LED light
may cause everlasting damage to your eyes. The research claimed that the
exposure of LED light can cause permanent harm to the retina of human eyes.
Once the retina cells are destroy by
prolonged and continuous exposure to LED rays, they cannot be replaced and will
not re-grow, ThinkSpain.com explained. So, it’s a very worried situation because
computer, mobiles and TV screens, and even traffic and street lights, have been
gradually replaced with LED.
What is LED?
A light-emitting diode (LED) is a
semiconductor light source. LEDs are used as indicator lamps in many devices
and are increasingly used for other lighting.
blue LEDs and cool-white LEDs are now capable
of exceeding safe limits of the so-called blue-light hazard as defined in eye
safety specifications such as ANSI/IESNA RP-27.1–05: Recommended Practice for Photo
biological Safety for Lamp and Lamp Systems.
Other
disadvantage:-
LEDs are more expensive than any other
lighting technologies; in 2010 the cost per thousand lumens (kilolumen) was
about $18. The price is expected to reach $2/kilolumen by 2015.
Cool-white LEDs with high color temperature
emit proportionally more blue light than conventional outdoor light sources
such as high-pressure sodium vapor lamps, the strong wavelength dependence of
Rayleigh scattering means that cool-white LEDs can cause more light pollution
than other light sources. The International Dark-Sky Association discourages
using white light sources with correlated color temperature 2700K-3000K.
Dr. Celia Sanchez Ramos, investigator at
Madrid’s Complutense University, told that “retina never regenerates itself once it has become damaged.”
Dr. Ramos said LED lights
are made up of rainbow longitude waves, and it is the blue part, which causes
the problem.
“LED
is fantastic if there is adequate protection,” she claimed.
Blue LED light bulbs are the most utilized color of LEDs, and are used on
everything from cell phones to television sets to medical equipment. Theories
about harmful effects began with complaints from consumers about the intensity
of the light and include such things as eyestrain, headaches, sleep
disturbances and cancer.
Researcher said that everyone should use LCD monitor for their computer
because everyone works on computer from very near distance.
UV light radiation
from 100 to 280 nm. (The radiations
with wavelengths from 10 to 180 nm propagate only in vacuum and thus are of
little value for our investigation. (Navy Environmental Health Centre,
Ultraviolet Radiation Guide, 1992 'UVRG1992') The radiation is transmitted
through air and through quartz but absorbed by ordinary glass. (UVRG1992)
UVB: from 280 to 315 nm; (The
radiation is transmitted through air and through quartz but absorbed by
ordinary glass.) [UVRG1992]
UVA: from 315 to 400 nm; is
easily transmitted through air and glass. (UVRG1992)
UVA2: from 320 to 340 nm. (It is
harmful to the skin.)
UVA1: from 340 to 400 nm. (It is
protective.) [Source: National Institute of Health]
Visible radiation: from 380 to 800 nm
The absorption of UVB induces direct DNA damage: basis changes, induced
covalent (abnormal formation of chemical bonds), strand breaks (DNA strands
drift apart). UVA radiation and visible light are not absorbed by DNA but by
exogenous or endogenous chromospheres that can, in an excited form, degrade the
genome.
Humans have their eyes open for around 6,000 hours a year, and most of
this time they are exposed to artificial light — for which reason Dr. Ramos
says the best way to prevent damage is to “close your eyes often to soften the
impact”.
She also said “using good sunglasses with UV filter rays, and a healthy
and varied diet rich in Vitamin A, which comes from spinach and peppers — will
protect the eyes”.
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