Welcome to Laser Pointer Forums! If you are looking for a laser you may want to check out the Laser Company Top Sites List. The link will open in a new window for your convenience.

Colorful 2018, Colorful Laser Power Meter
 Laser Pointers Lasers & Eyes

LPF Laser Pointer Company Database (link opens new window)

10-14-2008, 12:44 PM #65
 Junior Member Join Date: Oct 2008 Posts: 7 Rep Power: 0
corpse108
Junior Member

Join Date: Oct 2008
Posts: 7
Rep Power: 0
Re: Lasers & Eyes

Hi. I have a couple of questions.

Where can I find Safety Glasses? I'm having a hard time locating a site that sells them.

I saw the formula to calculate the correct OD but how do I find out the reduction factor of the laser? Does the Class of the laser have anything to do with this?

Thanks,
Josh

10-14-2008, 01:59 PM #66
 Class 4 Laser Join Date: Mar 2008 Location: Sunny Southern California Posts: 16,636 Rep Power: 12649
daguin
Class 4 Laser

Join Date: Mar 2008
Location: Sunny Southern California
Posts: 16,636
Rep Power: 12649
Re: Lasers & Eyes

Quote:
 Originally Posted by corpse108 Hi. I have a couple of questions. Where can I find Safety Glasses? I'm having a hard time locating a site that sells them. I saw the formula to calculate the correct OD but how do I find out the reduction factor of the laser? Does the Class of the laser have anything to do with this? Thanks, Josh

Peace,
dave
__________________
How To Get Along In and Be Accepted in the Forum

If you got some value out of reading this forum, how about donating \$2 to keep it going?

Love all, trust a few, do wrong to none.
-William Shakespeare

10-16-2008, 12:02 AM #67
 Junior Member Join Date: Oct 2008 Posts: 7 Rep Power: 0
corpse108
Junior Member

Join Date: Oct 2008
Posts: 7
Rep Power: 0
Re: Lasers & Eyes

Okay so the reduction factor is how much laser light the goggles block? Now how do I figure out how much light the laser puts out and how strong of a factor it takes to block it? I read somewhere that if you can see the laser with the goggles they are not strong enough.

10-30-2008, 11:58 AM #68
 Junior Member Join Date: Oct 2008 Posts: 7 Rep Power: 0
corpse108
Junior Member

Join Date: Oct 2008
Posts: 7
Rep Power: 0
Re: Lasers & Eyes

I found out. It is in the OD Post if anyone else is wondering and its very thorough.

11-20-2008, 08:26 PM #69
 Class 1M Laser Join Date: Mar 2008 Posts: 215 Rep Power: 15
Snytbaggen
Class 1M Laser

Join Date: Mar 2008
Posts: 215
Rep Power: 15
Re: Lasers & Eyes

A friend was here today and found my DX30 and started to play with it. I went upstairs and when I came down again he was shining it out of the window. I looked at the wall opposite of the window and didn't even know he was shining, since he was still in my room. I see a pretty large green blob floating around on the wall and barely had any time to react when BAM! right in my left eye. My eye seemed fine, however and I wasn't blinded or didn't see any spot. The hit was on the side of the eye, though, so is there any possibility that some damage occurred that I'm not aware of?

If my math serves me right, and if it's true that a reflection of a window is 5-10% of the original power I would have gotten around 1,5-3mW in my eye, spread out to a pretty large area. Is this correct?

12-02-2008, 01:14 AM #70
 Class 1 Laser Join Date: Nov 2008 Posts: 63 Rep Power: 10
lightfoot500
Class 1 Laser

Join Date: Nov 2008
Posts: 63
Rep Power: 10
Re: Lasers & Eyes

this thread is very helpful, lucky i started out with a 5mw.
may i suggest the senior members put together a document on proper use of lasers as far as the eyes are concerned. i am a newbie here so i wouldnt be the one to do it.

12-10-2008, 11:45 AM #71
 Class 1M Laser Join Date: Oct 2008 Posts: 103 Rep Power: 10
Antracith
Class 1M Laser

Join Date: Oct 2008
Posts: 103
Rep Power: 10
Re: Lasers & Eyes

Ok, I read this thread for the first time today and I got really scared!

I Have been playing around alot with my 50 mW dx laser and my 270 mW red DIY laser and I have gotten reflections from mirrors straight into my eye several times already. I must have been lucky caus I have still not experienced any sight degradation.

Is green the most dangerous? I mean, is a green 50 mW worse than a red on 270 mW? Is there good glasses that can protect me good from both green, red and violet? I am really gonna get myself a pair of gogles now. As a matter of fact, I am blind on my left eye because of a sickness called coates disease so I really don't wanna hurt my other eye...

12-10-2008, 01:52 PM #72
 Class 1M Laser Join Date: Nov 2008 Posts: 122 Rep Power: 13
StrictlyBudget
Class 1M Laser

Join Date: Nov 2008
Posts: 122
Rep Power: 13
Re: Lasers & Eyes

Quote:
 Originally Posted by Antracith Ok, I read this thread for the first time today and I got really scared! I Have been playing around alot with my 50 mW dx laser and my 270 mW red DIY laser and I have gotten reflections from mirrors straight into my eye several times already. I must have been lucky caus I have still not experienced any sight degradation. Is green the most dangerous? I mean, is a green 50 mW worse than a red on 270 mW? Is there good glasses that can protect me good from both green, red and violet? I am really gonna get myself a pair of gogles now. As a matter of fact, I am blind on my left eye because of a sickness called coates disease so I really don't wanna hurt my other eye... Great thread btw!
all i can say is, you're not responsbile enough to handle a laser pointer. come on! the first time you got hit in your eyes, you should have been running to your computer to order a laser goggle. :-/

i think the more visible the laser is, like Green, the more the damage will be on the retina (the part that gives you colour vision). it might also damage the other components of your eye like the cornea. for an invisible laser, it might damage all the components of your eye but it won't damage your retina. also, it is harder to notice the damage in your vision unless you go for a check up for the case of an invisible laser. am i right?

12-10-2008, 03:35 PM #73
 Class 2M Laser Join Date: Sep 2007 Posts: 977 Rep Power: 81
FrothyChimp
Class 2M Laser

Join Date: Sep 2007
Posts: 977
Rep Power: 81
Re: Lasers & Eyes

Any high enough power of any visible wavelength and near UV as well as near IR will damage your retina the same. All these wavelengths will be focused by the cornea and lens onto the retina. So mW for mW or W for W you do the same damage. There is no preference based on wavelength.

The UV region and mid-IR and far-IR is another story. UV will cataract your lens never making it to the retina. Mid-IR will show signs of retinal damage and corneal/lens damage whereas far-IR will damage the cornea and lens exclusively.
__________________
The Frothy Chimp
Cynic Extraordinaire
Why yes, I am a rocket scientist

Good whiskey, fine cigars, long legged women and blues guitar.
That's what I like.

The strong shall stand, the weak shall fall by the wayside.

12-10-2008, 04:34 PM #74
 Class 4 Laser Join Date: Sep 2007 Location: Wisconsin Posts: 9,293 Rep Power: 208829
Cyparagon
Class 4 Laser

Join Date: Sep 2007
Location: Wisconsin
Posts: 9,293
Rep Power: 208829
Re: Lasers & Eyes

Your retina is red. Therefore, more red is required to burn it than green.
__________________
A problem well stated is a problem half solved.

12-10-2008, 05:55 PM #75
 Class 2M Laser Join Date: Sep 2007 Posts: 977 Rep Power: 81
FrothyChimp
Class 2M Laser

Join Date: Sep 2007
Posts: 977
Rep Power: 81
Re: Lasers & Eyes

Not true. The retina is clear. The red coloring comes from the blood vessels in the choroid layer below the retina. So, the laser light always passes through the retina doing whatever damage is to be done before passing to the vasculature.
__________________
The Frothy Chimp
Cynic Extraordinaire
Why yes, I am a rocket scientist

Good whiskey, fine cigars, long legged women and blues guitar.
That's what I like.

The strong shall stand, the weak shall fall by the wayside.

12-10-2008, 06:43 PM #76
 Class 1M Laser Join Date: Nov 2008 Posts: 122 Rep Power: 13
StrictlyBudget
Class 1M Laser

Join Date: Nov 2008
Posts: 122
Rep Power: 13
Re: Lasers & Eyes

Quote:
 Originally Posted by FrothyChimp Any high enough power of any visible wavelength and near UV as well as near IR will damage your retina the same. All these wavelengths will be focused by the cornea and lens onto the retina. So mW for mW or W for W you do the same damage. There is no preference based on wavelength. The UV region and mid-IR and far-IR is another story. UV will cataract your lens never making it to the retina. Mid-IR will show signs of retinal damage and corneal/lens damage whereas far-IR will damage the cornea and lens exclusively.
that was what i was trying to say. visible and invisible lasers do different damages. thanks for clearing it up.

12-25-2008, 08:40 PM #77
 Class 1M Laser Join Date: Aug 2008 Posts: 206 Rep Power: 12
suiraM
Class 1M Laser

Join Date: Aug 2008
Posts: 206
Rep Power: 12
Re: Lasers & Eyes

Quote:
 Originally Posted by lightfoot500 may i suggest the senior members put together a document on proper use of lasers as far as the eyes are concerned. *i am a newbie here so i wouldnt be the one to do it. *
I'm not a senior member, but I can make such a document. Here it is:

Never expose an eye to direct or reflected laser light. Never expose an eye to diffuse light from a powerful laser. Wear protective goggles for the laser type and power you are using; it's not a question of being able to afford them, as the laser is purchased with the money left over from buying the goggles. No exceptions, excuses, rationalizations or justifications. Make sure you know where windows, mirrors and reflective surfaces are, and be aware of the entire path of the beam until it reaches a matte surface. Don't use a laser around anyone who either disagrees with this policy, or is unfamiliar with it. There is no such thing as a harmless prank when lasers are involved. Let exactly the same people use your laser as you would let screw your girlfriend without a condom. You may not notice laser damage, so leave it to the eye doctor decide if your eyes are okay; seek one out after any accidental exposure.

Pretty simple, huh?

As for the guy who had several accidental exposures, the correct course of action is to go to an eye doctor, explain that accidental exposure to a laser has occured, and then get both a visual field test and a slit lamp examination. Also, pay close attention to your reading speed, both eyes and each eye by itself. Even if you don't notice any damage, that doesn't mean damage hasn't occured. A laser is focused to a tiny spot on the retina, and the brain will try to compensate for it, just like it does with the blind spot in front of the optic nerve. Hence, a dead area in your field of vision may not be obvious. A slit lamp examination will usually reveal any spots that have been damaged. OCT is better, but not readily available.

And I concur with the idea that putting down the laser for good is a good idea. Even a 5mW red is going to look pretty literally like &quot;the light of a thousand suns&quot; when you get it in your eye, at least within its spectral range, so the common sense response would be to avoid repeating that, and the intelligent response would be to get a pair of goggles as well. Since neither has occured, it's safe to say that responsible handling of a green laser or a higher powered red... *is probably beyond you.

12-25-2008, 09:19 PM #78
 Class 1 Laser Join Date: Jan 2008 Posts: 59 Rep Power: 11
dvdg101
Class 1 Laser

Join Date: Jan 2008
Posts: 59
Rep Power: 11
Re: Lasers & Eyes

Quote:
 Originally Posted by corpse108 Hi. I have a couple of questions. Where can I find Safety Glasses? I'm having a hard time locating a site that sells them. I saw the formula to calculate the correct OD but how do I find out the reduction factor of the laser? Does the Class of the laser have anything to do with this? Thanks, Josh

01-22-2009, 06:49 PM #79
 Class 2 Laser Join Date: Dec 2008 Posts: 464 Rep Power: 28
Xer0
Class 2 Laser

Join Date: Dec 2008
Posts: 464
Rep Power: 28
Re: Lasers & Eyes

Oh Caligvla... thank god its all alright now, good to hear that your eyes will heal !

This remebers me of the time i was young, my first laser was such a red Souvenir-Shop Keychain thing, i played around at holliday on Mallorca. And so stupid i was about safety, i some times had look into the beam directly. Luckily it not damaged my eyes, at least i think so, i never had any complications after.
had even an eye check last year and remember to been slit-scanned and the doc said everything allright.

Im into Bluray just since Dec 08, my first &gt;10mW Laser. The first time i just played with it and shined around the room, having set the current just-above-threshold. i was curious what it can more, so i turned up the driver for some second and back again, afraid of the radiation. repeated this some times. then the first attemp to burn something, allthough i self said to me when buying, that i dont want to burn things. but i had such a fear of damagin my eyes, so i did it so: 1. reduced the current under threshold 2. focussed the faint dot as small as possible and alignet the &quot;testing object&quot; 3. put the box of my mulitmetre (just griped the nearest rectangular thing laying around) sideways to beam direction to shield me up and only then 4. powered up the driver and enjoyed the smoke rising up ;D i think i had very great luck too because not far away thete was aluminium foil of my chocolate santa so if i would hit it the reflections may have come very very evil.

next day i had fear of having damaged my eyes by looking at the dot on the wall 5ft away
...but it was just my almost daily eye dryness due to my old out-of-focus CRT im using
(yes i know how to fix this, but i not wanna do it myself, there are f*k'n 25kV inside )

So what i wanted to say... :
I will get Googles at first before building my Scanner this year !!!

And @ Cali: Just the question, you arent using a crt screen, arent you?
Just cuz i feel the same &quot;haze&quot; simptome often after using my PC long...
__________________
sssSSSSssssSSS

01-27-2009, 01:44 PM #80
 Class 1M Laser Join Date: Jan 2009 Posts: 100 Rep Power: 10
micallen
Class 1M Laser

Join Date: Jan 2009
Posts: 100
Rep Power: 10
Re: Lasers & Eyes

So what would be a safe distance to view the dot on a white wall - good rule of thumb?? Talking specifically about a 50 mw greenie.

Also, I bought it from LED Shoppe. Does anyone know if they have an IR filter?
__________________
_____________
Micallen

 Thread Tools Display Modes Linear Mode

 Posting Rules You may not post new threads You may not post replies You may not post attachments You may not edit your posts BB code is On Smilies are On [IMG] code is On HTML code is OffTrackbacks are On Pingbacks are On Refbacks are On Forum Rules

All times are GMT. The time now is 10:14 AM.

 -- DarkShadows V5 -- Responsive LPF -2562016 -- Default Style Contact Us - Laser Pointers - Archive - Top