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Old 01-07-2015, 03:56 AM #1
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Default Just a reminder. Be Careful. Another Eye Injury.

I'm helping a young gentleman right now via email.
He got up close and personal with the scattered IR light from a DPSS pump diode.

As far as he can remember, he held the laser chassis up to his face with the lid off to examine where the pump beam was landing.

A few days later, he discovered a "cloud" of retinal burns in his peripheral vision in one eye.

He did not go to the ER and it was hard to get his parents to take him seriously.
Results, a week and a half before he saw the Eye Surgeon. He had to see an Optometrist before the Ophthalmic Surgeon would see him, resulting in more delay. If in Doubt, GO TO THE ER. Don't wait for or allow the insurance company to make long delays.

Guys, wear Goggles. This young man already had considerable experience with lasers at age 19. One day he just did not think about what he was doing.

The surgeon found one lesion and cannot see the other damage on the retina.

Prompt treatment to reduce swelling might have reduced damage in this case.

When He called, I found myself trying to wake up specialists on Christmas Eve.
We did find him a bit of professional advice on what to tell the first Doctor.



Lessons learned:

Lesions from accidental laser injuries are often behind the Retina's first Layer. The Layer behind carries the Blood flow to the Retina and Optic Nerve. . If this is the case, it is difficult to diagnose without a simple test. This test requires an injection of a harmless fluorescent dye into the bloodstream. The injection is in the Arm, not the Eyeball. A UV light then shows the dye flowing across the eyeball a few seconds later. Lesions in the Choroid may then show up as dark spots. This test is known as "Fluorescein Angiography", and is simple and almost painless.


If in doubt, press for professional treatment by getting the Doctor to talk to a Retinal Surgeon familiar with Laser Eye Surgery. Your average Eye specialist may have no experience with Laser Lesions and thus have no idea what to do.

Sadly, the damage is likely permanent.


Steve


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Old 01-07-2015, 04:00 AM #2
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Default Re: Just a reminder. Be Careful. Another Eye Injury.

Yet another reason to play it safe and always use goggles. Posts like these give me the chills and make me feel queasy.
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Old 01-07-2015, 01:06 PM #3
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Default Re: Just a reminder. Be Careful. Another Eye Injury.

Sad to see another laser enthusiast with an eye injury, but an important reminder for the rest of us to keep safety, especially eye safety, in the forefront of our thoughts, when enjoying our hobby!

Thanks LSRFAQ, for sharing this story.
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Old 01-07-2015, 09:59 PM #4
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Default Re: Just a reminder. Be Careful. Another Eye Injury.

Good info. +REP for posting this.
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Old 01-08-2015, 07:26 AM #5
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Default Re: Just a reminder. Be Careful. Another Eye Injury.

Thank you for the post, I intend on working with high power 808nm IR DPSS soon. I did buy a pair of Glendale Argon/Nd-GaAS goggles good to better than OD 5 at 808nm. Perhaps OD 5 isn't enough for a 50W 808nm? I also have one of those as a FAP. I suppose, it depends on what you are doing, or shouldn't be doing with them. The last time I worked with the high power FAP808 I wore goggles and looked at the beam with the camera in my cell phone to be able to see it burn through some wood, I won't even look at the beam directly with my goggles on then. I can't think of anything more precious than eye sight except life itself.

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Old 01-08-2015, 06:53 PM #6
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Default Re: Just a reminder. Be Careful. Another Eye Injury.

Quote:
Originally Posted by Alaskan View Post
Thank you for the post, I intend on working with high power 808nm IR DPSS soon. I did buy a pair of Glendale Argon/Nd-GaAS goggles good to better than OD 5 at 808nm. Perhaps OD 5 isn't enough for a 50W 808nm? I also have one of those as a FAP. I suppose, it depends on what you are doing, or shouldn't be doing with them. The last time I worked with the high power FAP808 I wore goggles and looked at the beam with the camera in my cell phone to be able to see it burn through some wood, I won't even look at the beam directly with my goggles on then. I can't think of anything more precious than eye sight except life itself.

Now at 50 watts you need to take Physical measures to confine the beam and install interlocks. Sheet metal boxes are the norm at those powers. Black and White CCD cameras with a USB Digitizer are what I use at 808 nm. I watch the laptop screen through the Goggles.

Sheet metal boxes with 100% confinement and interlocks get you down to Class I.

Steve

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50 Joules, 700 Picoseconds 1064
32 Joules, 700 pS Green.
Nanosecond, Picosecond, Femtosecond.
HeCad, HeNe, CuBr, Krypton, Argon, N2, Dye, Ti:Saph,
Nd:YLF, Nd: VANDATE, ND:GLASS, OPG, SFM, RAMAN SHIFTED, DFG, OPA,UV Argon Ion, UV and IR (752/799) Krypton Ion
2,3,4th Harmonics of Yag. 13 lines of Mixed Gas, 575 Kr. 690 Kr . 18 lines of HENE. NEW FOR 2016! "Blue OPSL" and Raman Shifted Hene 651 ... New for 2017, Green OPSL, Coming Soon, Yellow OPSL Yet I've flipped Burgers, too.

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Last edited by LSRFAQ; 01-08-2015 at 06:54 PM.
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