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Old 11-19-2011, 04:59 AM #1
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Default Spasms from viewing lasers

I have two green pointers which are under 30mw and 20mw 405nm.


After I view a laser spots on the wall, I sometimes get twitching in my forehead and eyes become overly sensitive . It happens immediately when I turn on my 20mw 405nm which I have had on a total of 10 seconds since I got it.


This feeling sometimes lasts a few days before it goes away.

I looked at the amsler grid and I don't see anything wrong. So I don't think I have vision damage.

I tried IR filtering the pointers thinking IR might be causing it but it didn't help any.

Does anyone else have this problem with low powered pointers indoors without glasses?


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Old 11-19-2011, 05:07 AM #2
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Default Re: Spasms from viewing lasers

I have not had issues like this, but I have heard of others here on the forum being oversensitive to low powered lasers.
It would be advantageous of you to use glasses when indoors. That might help.
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Old 11-19-2011, 11:41 AM #3
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Default Re: Spasms from viewing lasers

Quote:
Originally Posted by Super Critical View Post
I have two green pointers which are under 30mw and 20mw 405nm.


After I view a laser spots on the wall, I sometimes get twitching in my forehead and eyes become overly sensitive . It happens immediately when I turn on my 20mw 405nm which I have had on a total of 10 seconds since I got it.


This feeling sometimes lasts a few days before it goes away.

I looked at the amsler grid and I don't see anything wrong. So I don't think I have vision damage.

I tried IR filtering the pointers thinking IR might be causing it but it didn't help any.

Does anyone else have this problem with low powered pointers indoors without glasses?
You should try wearing Laser Safety Goggles/Glasses to see
if that still happens....

BTW <5mW is considered Low Powered Laser power that could
be used relatively safely without Laser Safety Goggles/Glasses...


Jerry
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Last edited by lasersbee; 11-19-2011 at 11:46 AM. Reason: Spelling errors
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Old 11-19-2011, 05:59 PM #4
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Default Re: Spasms from viewing lasers

Quote:
Originally Posted by lasersbee View Post
You should try wearing Laser Safety Goggles/Glasses to see
if that still happens....

BTW <5mW is considered Low Powered Laser power that could
be used relatively safely without Laser Safety Goggles/Glasses...


Jerry
Yeah maybe the <5mw law was for a reason.

Are there goggles I can wear and still see the beam?

Or should I just find a new hobby?
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Old 11-19-2011, 06:14 PM #5
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Default Re: Spasms from viewing lasers

Quote:
Originally Posted by Super Critical View Post
Yeah maybe the <5mw law was for a reason.

Are there goggles I can wear and still see the beam?

Or should I just find a new hobby?
1.No, 2. Up to you.
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Old 11-19-2011, 06:25 PM #6
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Default Re: Spasms from viewing lasers

I had the same problem with 405nm lasers. I rarely used my 60mw violet but to be honest last year when I got new prescription glasses with "transitions" UV blocking lenses it helped alot, the transitions take the edge off the brain-scrambly feeling of the 405nm dot, at least for me.

As for your green lasers, I've had times of oversensitivity and when that happens I just go outside with them (at night) for a break. It's possible your 30mw laser is also overspec, and more power would intensify your problem.
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Old 11-19-2011, 09:01 PM #7
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Default Re: Spasms from viewing lasers

You might find this interesting.


..or this.
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Old 11-19-2011, 11:08 PM #8
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Default Re: Spasms from viewing lasers

Quote:
Originally Posted by Silvershot View Post
1.No, 2. Up to you.
So my only hope is to by lasers that are under 5mw. Either that or find a foggy open field.
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Old 11-19-2011, 11:16 PM #9
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Default Re: Spasms from viewing lasers

Quote:
Originally Posted by Woodofcville View Post
I had the same problem with 405nm lasers. I rarely used my 60mw violet but to be honest last year when I got new prescription glasses with "transitions" UV blocking lenses it helped alot, the transitions take the edge off the brain-scrambly feeling of the 405nm dot, at least for me.

As for your green lasers, I've had times of oversensitivity and when that happens I just go outside with them (at night) for a break. It's possible your 30mw laser is also overspec, and more power would intensify your problem.
Okay good to hear somebody else has this problem. I have never had a seizure or bad migraines but for people that do, I would recommend staying away from 405nm lasers. I may try the UV blocking glasses. I assume they block some violet too and just cut the power down.
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Old 11-19-2011, 11:39 PM #10
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Default Re: Spasms from viewing lasers

Quote:
Originally Posted by Super Critical View Post
So my only hope is to by lasers that are under 5mw. Either that or find a foggy open field.
Fog machines work great to see low power beams.
I also love to lase outside when grilling at night.
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Would you like to purchase some M-140 445nm diodes (individual or pressed into Aixiz or pure copper module) at very reasonable prices? PM me if you are interested!

My laser list has become way too big; I'm listing some of my favorites out of my extensive collection.
615mw 405nm/12X Spiderfire X-03
148mw 405nm/GGW in my "Hotlight-Saber" host
1920mw 445nm River Rock custom
1530mw 445nm Yobresal
1360mw 445nm Qumefox Sipik
800mw 445nm WL Arctic Spyder S3
240mw 473nm CNI Labby
8mw 473nm CNI Labby
528mw 532nm Lazerer Cannon
310mw 532nm Firedragon III
300mw 532nm CNI Labby
180mw 532nm SKY Laser
4x 147-267mw 532nm Waterproof
900mw 635nm in Temporary Finned Labby Sink
Several 635nm diodes awaiting a build
500mw 650nm Dual LPC-826 Labby
251mw 650nm/LPC-815 Ultrafire U-501B
Several 685nm diodes awaiting a build
3W 808nm diode awaiting build

Kenometer w/ Coherent Thermopile 10W
LaserBee 2.5W USB LPM
Radiant Alpha 2W LPMSOLD=Now in Kuwait!
1.2W RGB Projector; JNM Wide Sky Galvos (Made in Germany); Laser Show Express; Arduino-based DAC
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Old 11-20-2011, 02:53 AM #11
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Default Re: Spasms from viewing lasers

You could also say screw the fog and go with higher powers, then you'd need safety goggles indoors and outdoors it'd be impressive with zero fog. Around 1W of 445nm and 150mW 532nm both look great at night, no fog needed.
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Last edited by Woodofcville; 11-20-2011 at 02:53 AM.
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Old 11-21-2011, 12:07 AM #12
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Default Re: Spasms from viewing lasers

Quote:
Originally Posted by Super Critical View Post
Okay good to hear somebody else has this problem. I have never had a seizure or bad migraines but for people that do, I would recommend staying away from 405nm lasers. I may try the UV blocking glasses. I assume they block some violet too and just cut the power down.
I dont think the issue is with actual physical damage to the eye at all.

Many people experience that the 405 nm dot is very difficult to focus on. This is mainly so because the brain/eyes determine its distance and then focus the lens at that distance. The problem is that 405 is just on the edge of the visible spectrum and the refractive index of the eye lens is slightly 'off' compared to normal white light.

This may cause you to shift focus between correct for 405 and correct for average wavelengths when looking at the dot. I experience something similar with the 405s - and although it doesnt harm the eye, it is uncomfortable.

UV blocking lenses or glasses may help: while wearing those you will only see the fluorescense of the dot which is close to white and doenst cause focus problems as much.

As for how long the discomfort may last: perhaps your vision system gets adjusted to focussing on 405 after some time, causing it to misfocus on normal light for some time after. I wouldn't not expect this to last longer than minutes, but everyone reacts differently to these unnatural situations.
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Old 11-22-2011, 12:56 AM #13
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Default Re: Spasms from viewing lasers

Quote:
Originally Posted by Woodofcville View Post
You could also say screw the fog and go with higher powers, then you'd need safety goggles indoors and outdoors it'd be impressive with zero fog. Around 1W of 445nm and 150mW 532nm both look great at night, no fog needed.
Saftey goggles meran you can never see the beam without a camera unless Silvershot was kidding. I also worry about the higher power lasers hitting unintended targets, not as much of a concern in Oklahoma. I like the fog machine, we get foggy a lot of nights here in Maryland anyway. Great for laser shows.
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