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You're gonna go blind if you keep doing that. ;-)

Lifetime17

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Hi Paul,
Basically your correct the two have the same outcome the nose always ends up Brown. I do my job well and theres no need for sniffing anything. A saying goes its not who you know it's who you b--- . Thank you for the input buddy..

Rich:)
 



Cyparagon

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OK that's it. I'm DONE with UV through 540 nm. Henceforth I go about my day with my Eagle Laser Safety glass on-full time! ;-)

I know you're in jest, but it's goofier than you think. Because that would be voluntarily color blinding yourself instead of risking partial blindness in old age.

"You might go partially blind in 50 years"
"No, I go partially blind now. Take it or leave it."

:thinking:
 

lasersbee

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You need to speak up I can't see you
anymore...:whistle:

Jerry
 

Cyparagon

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I'd love to see anything you are doing with lasers

What if I don't have any projects at the moment? Is that a PROBLEM for you? Why complain to only me about this? There are countless people here that don't share projects regularly.

all you do is help clear the air of misconceptions

If you can't provide an answer as to why this is a problem, kindly shut the :bday: up.
 

Lifetime17

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Hi,
Basically we all all gong blind to the original thread what It states. But all comment here are open to ???'S..

Rich:)
 

Benm

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Well, they may actually be right. It's not really the blue light that is to blame for it, but our current life expentancies that so far exceed the natural lifespan of humans (40-ish years).

Of course we evolved with exposure to sunlight, and without sunglasses for that matter. So there would be some logic to conclude that naturally occurring every day things like daylight pose no danger to us.

And yeah, if you count up to age 40 or 50, daylight is not that dangerous at all. But when you stretch that life expectancy to 80 or 90 years you may encounter some problems. One very common visual one is cataracts which many people develop at some point, perhaps in their 60s-80s, and can be remedied.

Others are things like downright melanoma which you rarely survive unless caught very early.

So if your vision worsens from retinal damage by the time you're 80 years old that could be perfectly possible by natural factors - at that time your body is at about double it's "designed lifetime" and evolution definitely has not kept up with such a sharp rise in life expectancy.

In 50 years we'll probably be advised not to use keyboards because it'll wear out the cartilage in our fingers by age 110 or something :D
 

Pelagius

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Cyparagon,

Haha! My other option was to keep my eyes closed at all times!

I know you're in jest, but it's goofier than you think. Because that would be voluntarily color blinding yourself instead of risking partial blindness in old age.

"You might go partially blind in 50 years"
"No, I go partially blind now. Take it or leave it."

:thinking:
 

Shotgundrums

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No one told me that, I was fearless.

Personally, I believe guys are going blind from pounding their puds. That was what I was told as a youngster. :crackup:

OMG, the sky is blue and it's everywhere :(

I have several blue lasers and I keep getting older. Maybe I should rid myself of them before I die of old age. Personally, I think doggie butt sniffing is the cause of fleas and ticks.

But...But...All Dogs sniff other dogs butt's....and...old dogs get cataracts....SOoooo

Butt sniffing results in Doggie Cataracts !!! Non-Sequitur of the Day !! CDBEAM

Gee whiz, doggy but sniffing and pud pounding, the mental images here are blinding, and water is obviously toxic, everyone who's ever drank any is going to die.
:crackup::crackup::crackup::crackup::crackup: :crackup::crackup::crackup::crackup:
Perhaps this is why every woman Dr. Manhattan sleeps with gets cancer.
 
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Cyparagon

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Of course we evolved with exposure to sunlight, and without sunglasses for that matter. So there would be some logic to conclude that naturally occurring every day things like daylight pose no danger to us.

While I'm in agreement with this point in particular (that the sun is mostly harmless to the eye), this logic doesn't apply many other other places. 3 brief examples:

We evolved with exposure to pathogens, and without modern medicine for that matter. So there would be some logic to conclude that pathogens pose no danger to us.

We evolved with exposure to grizzly bears and tigers, and without modern hunting implements for that matter. So there would be some logic to conclude that carnivorous killing machines pose no danger to us.

We evolved bearing children, and without modern hospitals for that matter. So there would be some logic to conclude that childbirth poses no danger to the mother or the child.
 
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Benm

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Those points are all valid, and the do pose a threat to individuals, though not to the existence of the human species. Evidence that we are still here, and in great abundance, more or less proofs that.

Pathogens have wiped out a significant portion of the human population, with something like the black death killing between a quarter and a half of all humans in the 14th century.

This was obviously before we even knew of bacteria, and certainly had no antibiotics or anything useful to fight against it, but some people were either immune to it, evade infection or both.

It's always a matter of averages: afaik we have not evolved any mechanism to protect us when struck by lightning. Surely some people get struck by lightning every year, and most of them do not survive it, the number is so small it doesn't have a significant effect on total population. If for some reason we lived on a world where people got struck by lightning once a year on average or so, we'd probably have evolved lightning rods of sorts... a bit like how electric eels manage not to electrocute themselves ;)
 

Pelagius

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Cyparagon,

Haha! My other option was to keep my eyes closed at all times!

I know you're in jest, but it's goofier than you think. Because that would be voluntarily color blinding yourself instead of risking partial blindness in old age.

"You might go partially blind in 50 years"
"No, I go partially blind now. Take it or leave it."

:thinking:
 

paul1598419

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Those points are all valid, and the do pose a threat to individuals, though not to the existence of the human species. Evidence that we are still here, and in great abundance, more or less proofs that.

Pathogens have wiped out a significant portion of the human population, with something like the black death killing between a quarter and a half of all humans in the 14th century.

This was obviously before we even knew of bacteria, and certainly had no antibiotics or anything useful to fight against it, but some people were either immune to it, evade infection or both.

It's always a matter of averages: afaik we have not evolved any mechanism to protect us when struck by lightning. Surely some people get struck by lightning every year, and most of them do not survive it, the number is so small it doesn't have a significant effect on total population. If for some reason we lived on a world where people got struck by lightning once a year on average or so, we'd probably have evolved lightning rods of sorts... a bit like how electric eels manage not to electrocute themselves ;)


The only people who have immunity to Yersinia pestis are those who have lived through a prior infection. You have memory cells in your immune system that carry the antibodies for this disease and will start to grow and increase if another infection occurs later. It is the whole premise behind vaccinations. One is infected by parts of the surface antigens of the bacteria or virus or a killed pathogen or attenuated one is used.
 

Benm

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I'm not sure that -everyone- that survived the plague did so due to a previous non-lethal infection, perhaps some people were naturally immune, or at least able to survive being infected (the latter would be inferred if the previous-infection hypothesis is true).


But that's all a bit beside the point: Reduced visual acuity is probably largely an age related phenomenon, just as loss of hearing is - virtually all people at older age hear less than young people, especially at higher frequencies. It's not you -will- be totally deaf by age 90 or anything, but chances are you will hear a lot less than you did in your 20s, even if you were never exposed to dangerous/damaging sound levels.

I suspect something similar may happen in the eye: while we can replace the lens in case of cataracts, the retina also ages, and perhaps similar to in the inner ear, makes degeneration of vision inevitable with age.

In that sense i think it's actually fairly comparable to hearing: exposure to very loud noises (like firing a gun indoors without ear protection), even briefly, damage your hearing ability. This may be true for bright light as well, even if it's not SO bright it causes a visible scar on the retina like you would get from looking into a high power laser.

Getting a photo-flash in your eyes every minute may just as well damage your eyes faster than not doing so, even though the exposure level is not considered 'dangerous' for a single flash photo.

It may just be the bane of achieving older and older ages. You can prevent people of dying to a pretty large degree, but not from ageing... at least at this moment in time.

Perhaps we will discover technologies to rejuvenate all kinds of tissues at some point. At that point people will stop dying of natural causes though, and while very sci-fi, would pose quite a lot of problems.
 

paul1598419

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You don't have a good understanding of your immune system. If you have never before been exposed to a pathogen, your immune system will launch a number of reactions against it. One of these is to make antibodies against the surface of the pathogen. If this is successful, you will live and also gain immunity against this pathogen in the future. The system that does this is beyond the scope of this thread, but it is how people gain immunity against pathogens they have never before encountered. There are no 100% lethal pathogens. Even rabies, untreated, has survivors. Not many, but some.
 

lasersbee

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The saying..."If it doesn't kill you it will
make you stronger" comes to mind...:beer:

Jerry
 




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