Old 08-08-2018, 05:09 PM #1
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Default You're gonna go blind if you keep doing that. ;-)

Chemists discover how blue light speeds blindness https://m.phys.org/news/2018-08-chemists-blue.html
Karunarathn's lab found that blue light exposure causes retinal to trigger reactions that generate poisonous chemical molecules in photoreceptor cells.



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Old 08-08-2018, 05:21 PM #2
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Default Re: You're gonna go blind if you keep doing that. ;-)

They don't give a range in nanometers for what is damaging, I guess we should assume all shades of blue.
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Old 08-08-2018, 05:56 PM #3
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Default Re: You're gonna go blind if you keep doing that. ;-)

Quote:
Originally Posted by Alaskan View Post
They don't give a range in nanometers for what is damaging, I guess we should assume all shades of blue.
click the link at the end for details.
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Old 08-08-2018, 06:26 PM #4
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Default Re: You're gonna go blind if you keep doing that. ;-)

Well that sucks.
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Old 08-08-2018, 06:41 PM #5
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Default Re: You're gonna go blind if you keep doing that. ;-)

Yowsa, just microwatts of 445nm light over the course of just a few minutes seems deadly to cells according to this study. I'm thinking this may re-ignite the discussion of whether it's safe to view the dot from a high power blue laser. Maybe my next high power build should be RED
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Old 08-08-2018, 10:09 PM #6
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Default Re: You're gonna go blind if you keep doing that. ;-)



Do we really need to go over this shit again? Fine.

All white light, natural and artificial, has a large blue component. Everyone here should know that by now. You are exposed to large amounts of blue light all day every day and there's really no way around that. Your dose of blue light from playing with pointers is a TINY fraction of your "background dose".

It's like saying nitrogen is toxic to lung cells. All of humanity is exposed to huge amounts of nitrogen from the air itself, and yet the vast majority of humanity has healthy lungs. It just doesn't register with me.


Quote:
Originally Posted by WizardG View Post
Yowsa, just microwatts of 445nm light over the course of just a few minutes seems deadly to cells according to this study.






And if you honestly believe that, how do you propose avoiding all white light?
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Old 08-08-2018, 11:02 PM #7
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Default Re: You're gonna go blind if you keep doing that. ;-)

Seems like they are suggesting this is only an issue for people in an older age group that also have immune system problems. There is blue light everywhere and there is no way to avoid it. If you are going to go blind in your 70s, that is just something you likely will not be able to avoid if it is because of blue light exposure. It hasn't affected my vision yet and this article isn't going to have me awake nights worrying about it.
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Old 08-09-2018, 12:35 AM #8
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Default Re: You're gonna go blind if you keep doing that. ;-)

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
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Old 08-09-2018, 01:10 AM #9
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Default Re: You're gonna go blind if you keep doing that. ;-)

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.
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Old 08-09-2018, 01:16 AM #10
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Default Re: You're gonna go blind if you keep doing that. ;-)

OMG, the sky is blue and it's everywhere
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Old 08-09-2018, 01:20 AM #11
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Default Re: You're gonna go blind if you keep doing that. ;-)

Personally, I believe guys are going blind from pounding their puds. That was what I was told as a youngster.
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Old 08-09-2018, 02:23 AM #12
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Default Re: You're gonna go blind if you keep doing that. ;-)

No one told me that, I was fearless.
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Divergence to spot size calc: - 1 mRad is about .057 degrees which expands to be ~very~ roughly ~10% the diameter of the moon or sun at their distances.

Divergence Calculator: pseudonomen137's JScript mRad Calculator - Measure your lasers beam dia. at 1 foot & then 20'.

Online calc. to determine spot intensity at different mRad's & powers: http://tinyurl.com/divergence-calculator

Laser Power Density Calculator: Laser Power Density Calculator - Ophir

Build a beam expander to reduce divergence: http://tinyurl.com/BeamExpander

University YAG Project The Professor's Homebuilt Lasers Site - YAG Lasers

YAG Power Calc. Laser Peak Power Calculator - Ophir

Angular Size Calculator; use with diode angle of radiation spec. for lens dia. at FL: Angular Size Calculator

RHD's Relative Brightness vs Wavelength Calc: https://tinyurl.com/RHD-brightness

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Old 08-09-2018, 02:35 AM #13
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Default Re: You're gonna go blind if you keep doing that. ;-)

TMI!
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473nm 50 mW BWB-10-OEM DPSS
477nm 127 mW 501B
488nm 135 mW EDC Sharp diode
488nm Uniphase #2201-20SLAT argon laser head and power supply >40mW
493nm 120 mW 501B
502nm 110 mW 501B Lifetime
520nm LaserLands pointer Measures 510nm
532nm LSR532H-1W Laser, LSR-PS-N1 Driver, RS-75-5 P.S. 1300 mW
532nm 200mW Thermostatically Controlled Fan Cooled (Besram) >230mW
532nm 189mW pocket lab laser
532nm lasers X6 100mW-200mW
532nm lasers X4 75mW- 140mW
574nm OptLaser DPSS Laser 36 mW
632.8nm P210 New Laser Tube 0.57mW Melles Griot 05-LMP-827-037 PS
632.8nm Spectra- Physics He- Ne #102-2 4mW heads X2 and #236 power supply
632.8nm PMS He-Ne # 201P/ LPS-115 2mW
632.8nm Siemens HeNe LGK7630S 7.6mW
638nm 1 watt Cyprus II
635nm 100mW pointer
650nm 65mW pointer
650nm 380mW 501B
808nm 1+W infrared laser
Ocean Optics USB2000 Spectrometer
B&W TEK BTC100 Spectrometers X3
Scientech Vector S310 with AC2500 10 Watt LPM/ Hyperion 6 Watt & 20 Watt LPM/ Radiant X4 3.7 Watt LPM
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Old 08-09-2018, 02:38 AM #14
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Default Re: You're gonna go blind if you keep doing that. ;-)

LOL, a joke.
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Divergence to spot size calc: - 1 mRad is about .057 degrees which expands to be ~very~ roughly ~10% the diameter of the moon or sun at their distances.

Divergence Calculator: pseudonomen137's JScript mRad Calculator - Measure your lasers beam dia. at 1 foot & then 20'.

Online calc. to determine spot intensity at different mRad's & powers: http://tinyurl.com/divergence-calculator

Laser Power Density Calculator: Laser Power Density Calculator - Ophir

Build a beam expander to reduce divergence: http://tinyurl.com/BeamExpander

University YAG Project The Professor's Homebuilt Lasers Site - YAG Lasers

YAG Power Calc. Laser Peak Power Calculator - Ophir

Angular Size Calculator; use with diode angle of radiation spec. for lens dia. at FL: Angular Size Calculator

RHD's Relative Brightness vs Wavelength Calc: https://tinyurl.com/RHD-brightness

High Current Pulse Diode Drivers: https://tinyurl.com/ya7whuk3
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Old 08-09-2018, 02:39 AM #15
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Default Re: You're gonna go blind if you keep doing that. ;-)

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.
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Last edited by RedCowboy; 08-09-2018 at 02:40 AM.
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Old 08-09-2018, 02:40 AM #16
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Default Re: You're gonna go blind if you keep doing that. ;-)

Men prefer blondes.
__________________

Attention new brothers of the collimated light!

Newbie advice: Please take the time to first make an introduction in the Welcome section before posting questions: - https://laserpointerforums.com/f37


Divergence to spot size calc: - 1 mRad is about .057 degrees which expands to be ~very~ roughly ~10% the diameter of the moon or sun at their distances.

Divergence Calculator: pseudonomen137's JScript mRad Calculator - Measure your lasers beam dia. at 1 foot & then 20'.

Online calc. to determine spot intensity at different mRad's & powers: http://tinyurl.com/divergence-calculator

Laser Power Density Calculator: Laser Power Density Calculator - Ophir

Build a beam expander to reduce divergence: http://tinyurl.com/BeamExpander

University YAG Project The Professor's Homebuilt Lasers Site - YAG Lasers

YAG Power Calc. Laser Peak Power Calculator - Ophir

Angular Size Calculator; use with diode angle of radiation spec. for lens dia. at FL: Angular Size Calculator

RHD's Relative Brightness vs Wavelength Calc: https://tinyurl.com/RHD-brightness

High Current Pulse Diode Drivers: https://tinyurl.com/ya7whuk3
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