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Old 04-01-2017, 03:46 PM #1
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Default Eye glasses ruin the beam of 405nm lasers?

I noticed this while playing around outside the other night with my sanwu 405nm. I recently got a new set of glasses, and I notice that they dramatically weaken the visual strength of a 405nm beam and make it look almost 'grayish'. Taking off my glasses the beam goes back to a familiar violet shade, and is much more visible(Although blurry). I assume this is due to some kind of UV filtering on the glasses which also blocks out 'near uv' wavelengths?


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Old 04-01-2017, 03:55 PM #2
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Default Re: Eye glasses ruin the beam of 405nm lasers?

Might be because sunlight contains a lot of UV, so this is protection for common consumer.
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Old 04-01-2017, 03:56 PM #3
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Default Re: Eye glasses ruin the beam of 405nm lasers?

UV coating on the glasses? A lot of glasses have that now to help protect our eyes from the harmful rays at that wavelength.
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Old 04-01-2017, 04:30 PM #4
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Default Re: Eye glasses ruin the beam of 405nm lasers?

Quote:
Originally Posted by Razako View Post
I noticed this while playing around outside the other night with my sanwu 405nm. I recently got a new set of glasses, and I notice that they dramatically weaken the visual strength of a 405nm beam and make it look almost 'grayish'. Taking off my glasses the beam goes back to a familiar violet shade, and is much more visible(Although blurry). I assume this is due to some kind of UV filtering on the glasses which also blocks out 'near uv' wavelengths?
Curious experiment; I know I have uv on my glasses, never tried to look at a 405 beam without them. Have to give it a try tonight. Thanks for the heads-up.
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Old 04-01-2017, 10:44 PM #5
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Default Re: Eye glasses ruin the beam of 405nm lasers?

Yeah, UV is the main cause of cataracts. If you spend a lot of time in the sunlight and live long enough you'll be getting them eventually.
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Old 04-01-2017, 10:56 PM #6
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Default Re: Eye glasses ruin the beam of 405nm lasers?

Do you know what kind of coating your glasses have? Material? I've noticed this with some of my glasses that were coated for glare.
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Old 04-02-2017, 12:13 AM #7
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Default Re: Eye glasses ruin the beam of 405nm lasers?

Quote:
Originally Posted by BobMc View Post
Curious experiment; I know I have uv on my glasses, never tried to look at a 405 beam without them. Have to give it a try tonight. Thanks for the heads-up.
I was thinking the same thing, I've never really tried to see if there is any improvement without my glasses, it'll be interesting, I may be seeing 405nm in a whole new way!

Quote:
Originally Posted by paul1598419 View Post
Yeah, UV is the main cause of cataracts. If you spend a lot of time in the sunlight and live long enough you'll be getting them eventually.
Yep, been there, did that, and unfortunately have them!
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Old 04-02-2017, 01:16 AM #8
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Default Re: Eye glasses ruin the beam of 405nm lasers?

I'd say it's a realitic option that glasses would dampen 405 nm light to various degrees.

I think even my contact lenses start to filter around there, though it's not that easy to compare as with glasses - the only viable way to switch between them is to wear only one contact lens, but my eyes have different correction factors so that would not be fair either.

I'm not sure if this UV filtering effect of contact lenses is intentional or just a result of the material used to make them, but it's certainly there for the ones i use. I guess it's a good thing in any case as it negates the need for sunglasses.
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Old 04-02-2017, 02:18 AM #9
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Default Re: Eye glasses ruin the beam of 405nm lasers?

Cool stuff to know. Interested in seeing what results some other people notice.
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Old 04-06-2017, 01:51 PM #10
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Default Re: Eye glasses ruin the beam of 405nm lasers?

this is normal for any protection glasses, u dont see the beam only the dot, means your eyes are protected.
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Old 04-06-2017, 02:40 PM #11
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Default Re: Eye glasses ruin the beam of 405nm lasers?

Quote:
Originally Posted by mortuus View Post
this is normal for any protection glasses, u dont see the beam only the dot, means your eyes are protected.

If you're replying to Razako it looks like he's talking about regular eye glasses, not any sort of safety glasses.
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Old 04-06-2017, 02:51 PM #12
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Default Re: Eye glasses ruin the beam of 405nm lasers?

Quote:
Originally Posted by diachi View Post
If you're replying to Razako it looks like he's talking about regular eye glasses, not any sort of safety glasses.
Affirmative.
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Old 04-06-2017, 05:34 PM #13
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Default Re: Eye glasses ruin the beam of 405nm lasers?

I have polycarbonate lenses with no coatings and I notice the same thing. A black light tube also looks dramatically dimmer through my glasses.
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Old 04-06-2017, 05:57 PM #14
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Default Re: Eye glasses ruin the beam of 405nm lasers?

Quote:
Originally Posted by WizardG View Post
I have polycarbonate lenses with no coatings and I notice the same thing. A black light tube also looks dramatically dimmer through my glasses.

I've noticed that with black lights too actually, although not with 405nm as far as I can remember.

Transition lenses will darken under a black light or 405nm light.
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Old 04-06-2017, 06:07 PM #15
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Default Re: Eye glasses ruin the beam of 405nm lasers?

Quote:
Originally Posted by Razako View Post
I noticed this while playing around outside the other night with my sanwu 405nm. I recently got a new set of glasses, and I notice that they dramatically weaken the visual strength of a 405nm beam and make it look almost 'grayish'. Taking off my glasses the beam goes back to a familiar violet shade, and is much more visible(Although blurry). I assume this is due to some kind of UV filtering on the glasses which also blocks out 'near uv' wavelengths?
Are you talking about mostly "clear" reading type glasses ?
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Old 04-06-2017, 07:35 PM #16
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Default Re: Eye glasses ruin the beam of 405nm lasers?

Quote:
Originally Posted by Accutronitis View Post
Are you talking about mostly "clear" reading type glasses ?
Yes, regular corrective glasses.
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405nm | Banggood LT-850 | "5mW" | Review Unit | Review WIP
445nm | Sanwu Laser Pocket Series | 400mW Metered
445nm | NDB7242E Pen Build | 60mW Metered | >>Build Thread<<
450nm | LaserPointerStore - Thor H2 | 1W(?) | Review Unit | >>Review<<
473nm | B&W Tek BWB-10-OEM | Ordered
488nm | Spectra Physics 163 Argon | ~30mW Metered
515nm | PL515 Pen Build | 50mW Metered | >>Build Thread<<
520nm | Laserlands 520 | 5mW | Review Unit | 3mW metered | >>Review<<
532nm | Gearbest 303 Pointer | 50mW Metered
532nm | Gearbest JD-850 Pointer | 30mW Metered (I think, need to re-test).
633nm | HeNe | 6mW
633nm | Spectra Physics 155 HeNe | <1mW >>Thread<<
650nm | Sanwu Laser Pocket Series | 200mW Metered
808nm | Melles Griot 532nm Lab Unit | No Crystals >10W | X2



Check out my Reddit Subreddit! >>/r/laserpointers<<

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