A Study Shows LED May Damage Human Eyes

http://www.ledinside.com/news/2013/5/led_damage_human_eyes_20130517


SNIP
Researchers said this is caused by the high levels of radiation in the 'blue band' , and is likely to become a global epidemic in the medium term given that computer, mobiles and TV screens, and even traffic and street lights, have been gradually replaced with LED. Experts are calling for the lights to have built-in filters to cut out the blue glare.

Here's a link to the newspaper story:
http://www.thinkspain.com/news-spain/22749/led-lighting-damages-eyes-says-spanish-investigator

I will find and post a link to the published study if it is in English.

BS, CFL has more blue than cool white LED, warm LED in 3000K range (common for bulbs and atchitectural lighting) has even less blue.
You can damage an eye with any light if it is strong enough. Blue causes problems with sleeping because it messes with melatonin production but again other light sources have blue band too.

The fact that they use "LED rays" immediatly invalidates this story as bullshit (especially if coupled with no publication available).

And the claim would be SO fuzzy that anything would fullfill it. "Prolonged and continuous exposure" alright.

"LED lights are made up of rainbow longitude waves"

Whatever they're smoking. I don't want any.

The researcher who published this is respected, and also very political AND has seems to have business relationships with companies that sell yellow filtered glasses and has some patents in this area.

Not use the study was actually done on humans but was tied into some other research that technically did not use LEDs but used a fluorescent source with shorter wavelengths (but not UV).

I could find no published paper and certainly nothing peer reviewed on direct human studies.

Semiman

Here is Dr. Sanchez's company website(this is the English version):
http://www.altaeficaciatecnologia.com/en/areas-de-negocio/prevencion-ceguera-evitable/

I will read through the relevant patents to see if I can find a link to any published papers.

Oh no, I've been looking at the Aussie Blue Sky for sixty years

I'll just add I always wear UV protection, in the way of UV filtered spectacles.

Norm

Here is a listing of her published research:
http://www.celiasanchezramos.com/index.php?p=23

Going to search for this paper:
Role of metalloproteases in Retinal Degeneration induced by Violet and blue light

slebans said:

Here is a listing of her published research:
http://www.celiasanchezramos.com/index.php?p=23

Going to search for this paper:
Role of metalloproteases in Retinal Degeneration induced by Violet and blue light

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Damn, this paper seems to only be available in a pay per view format. The paper is dated Oct 2012 so perhaps there is a more recent article that is responsible for this mess.
http://onlinelibrary.wiley.com/doi/10.1111/j.1751-1097.2012.01237.x/full

In vitro studies are silly without power levels published. There are several non sequitors in the most verbose articles: " Humans are meant to see with light, not look at it. Consumers (citation needed) are demanding yellow filters to reduce this dangerous radiation in our light." I'd love to see the power levels. In vitro lets you go to arbitrary power levels (1W/cm sq for 6 hours in a sterilization paper I read recently).

slebans said:

Damn, this paper seems to only be available in a pay per view format. The paper is dated Oct 2012 so perhaps there is a more recent article that is responsible for this mess.
http://onlinelibrary.wiley.com/doi/10.1111/j.1751-1097.2012.01237.x/full

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It is shown that LED radiations decrease 75-99% cellular viability, and increase 66-89% cellular apoptosis. They also increase ROS production and DNA damage. Fluorescence intensity of apoptosis was 3.7% in nonirradiated cells and 88.8%, 86.1%, 83.9% and 65.5% in cells exposed to white, blue, green or red light, respectively.

.... draw your own conclusions but it seems even red does damage and green a lot which pretty much tells me ANY light does damage.


This paper is 8 months old so I am not sure it is the actual study w.r.t. all the recent news reports.

Semiman

Wow, if she is respected then IMO she has an exceptional skills in feeding BS into people with power/money to fund BS researches. Good for her but we don't need to read that.
Staring 12h into any light (or into anything) would damage you eyes or brain, actually I think you would have to have a brain damaged already to do that
Also it seems she is testing blue, green, and red LEDs. This is not how white LED works. Look for color spectrum graph for white LED. Total BS.

AnAppleSnail said:

I'd love to see the power levels. In vitro lets you go to arbitrary power levels (1W/cm sq for 6 hours in a sterilization paper I read recently).

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Agreed. That's why I was trying to find the published paper. I want to know if she used radiant flux levels higher than we would be exposed to under direct sunlight.

slebans said:

Agreed. That's why I was trying to find the published paper. I want to know if she used radiant flux levels higher than we would be exposed to under direct sunlight.

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They are in the link I posted.

Semiman

slebans said:

Damn, this paper seems to only be available in a pay per view format. The paper is dated Oct 2012 so perhaps there is a more recent article that is responsible for this mess.
http://onlinelibrary.wiley.com/doi/10.1111/j.1751-1097.2012.01237.x/full

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There is a small possibility that I could get access to it via one of the dozen-plus library databases at school sometime next week.

SemiMan said:

They are in the link I posted.
Semiman

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Thanks! I don't know how I missed that.
I still want the original published document as the link you posted is missing a lot of the details of the experiment. Two critical factors that greatly influence the level of damage cause by light are oxygen levels and temperature of the culture medium.
Finally, in vitro does not duplicate the actual environment that the retinal cells are exposed to.

Here is too much info on this subject but the first 25% is easy to read:
http://www.photobiology.info/Rozanowska.html

slebans said:

and even traffic and street lights, .

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Who has BLUE traffic lights in their area ???