UV Glasses for Mc Gizmo UV lights

RedLed said:

What do we use to protect our eyes rom the 365nm for Norland curing? 3M makes many different ones, and it gets confusing?

I want ant to get a UV from Don, but need some glasses to go with it, any advice would be welcome?

Thanks,

RL

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archimedes said:

I was disappointed with the effectiveness of "regular" UV blocking glasses, but laser-certified lenses/goggles ( @365nm ) appear to provide much greater intensity reduction.

Very expensive, however.

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RI Chevy said:

The yellow lenses from 3M safety glasses are pretty good for moderate protection. Much better than nothing.

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RedLed said:

Where are you looking at these glasses? What companies? Also, do dentists use 365nm?

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archimedes said:

I was disappointed with the effectiveness of "regular" UV blocking glasses, but laser-certified lenses/goggles ( @365nm ) appear to provide much greater intensity reduction.

Very expensive, however.

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RedLed said:

Do you have any names of companies that make these glasses? That would be a big start in the right direction.
Thanks,
RL

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archimedes said:

Since it could be considered safety equipment, it may be prudent for individuals to research their own specific needs and suitability.

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more_vampires said:

http://noirlaser.com/

Do NOT buy unless you know exactly what it is you're buying. If you have the slightest doubt then it's time for more reading. Those things are REALLY expensive, so it's going to hurt in more than one way if you get the wrong thing.

To get a set with too weak of an OD gives a false sense of protection.

Good luck!

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RedLed said:

Thanks for the quick reply, so we should be safe between 195 to 540, with no problems?

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more_vampires said:

If and only if the OD (optical density) rating is correct for the intensity of your particular use.

The problem with having 1 set of eye shields and loaning them out is that you cannot guarantee that the intensity of the light source they are using is not as bright as the intensity of YOUR light source or even the same wavelength.

2 criteria for eye protection:
1. The eye shields must block ALL of the wavelengths you're working with.
2. The "darkness" aka "optical density" of the lenses must be dense/dark enough to actually do anything.

Sunglasses for this are out of the question. Your irises will dilate and make you more vulnerable to bad frequencies, sunglasses are some of the worst eye protection out there. They love making false claims like "blocks 100% UVA UVB." BS. They didn't say at what intensity.

Hope that made sense.[/QUOTE

Yes, you put that in clear terms even someone like myself with no real study in this field understood? Also, I have never thought the claims to sunglasses to be true, the advertisers lie. I had to have cataract surgery when I was 39, and always wore good quality sunglasses from the optometrist. I fact, I have to have it all re done soon.

How do we go about researching this? So many in academia tell you things so wrong, but of course they in their own minds are never wrong, ever, and could never, ever be wrong. My wife is an academic and I have to correct her on things all the time. (Say, don't take this wrong if you have an advanced degree, I think if you do, you will understand where I am coming from). However, please continue with this as many of our friends here could be doing damage they don't understand fully, and that's not good...Trit vials are too cool not have over a pair of glasses.

So, are you saying we need an exact pair for 365 nm? That I was not completely clear on, but you put the rest in a nice focus of understanding.

You know, your code name here on the forums involves vampires, if you know any maybe they could do the work for us! they seem to be able to see in the dark, keep late hours and have eyes exempt from UV, only bright sunlight, and could have a side line in the Trit. Vial install industry! Would they take blood as payment for these services? Plus they are always well spoken with a good command of the language, most polite, and wear some pretty sharp threads, always perfectly dressed, in some cases over dressed and very well groomed.

They all have impeccable taste, and seem to be brought up in good homes, and are very well educated. Except for the biting thing they would make great neighbors, I bet their lawns are perfect, and they drive nice cars, or no, wait they fly? Right?

All, joking and kidding around aside, the UV thing is a serious matter, and you seem to know about this subject, and I thank you for your help. And hope you will continue to help us find the protection we are looking for and need.

Thank you so much,

With all best wishes,

RL

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Maximum permissible exposure
The maximum permissible exposure (MPE) is the highest power or energy density (in W/cm2​ or J/cm2​) of a light source that is considered safe, i.e. that has a negligible probability for creating damage. It is usually about 10% of the dose that has a 50% chance of creating damage[7]​ under worst-case conditions. The MPE is measured at the cornea of the human eye or at the skin, for a given wavelength and exposure time.

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The use of eye protection when operating lasers of classes 3B and 4 in a manner that may result in eye exposure in excess of the MPE is required in the workplace by the U.S. Occupational Safety and Health Administration.

Protective eyewear in the form of spectacles or goggles with appropriately filtering optics can protect the eyes from the reflected or scattered laser light with a hazardous beam power, as well as from direct exposure to a laser beam. Eyewear must be selected for the specific type of laser, to block or attenuate in the appropriate wavelength range. For example, eyewear absorbing 532 nm typically has an orange appearance, transmitting wavelengths larger than 550 nm. Such eyewear would be useless as protection against a laser emitting at 800 nm. Furthermore, some lasers emit more than one wavelength of light, and this may be a particular problem with some less expensive frequency-doubled lasers, such as 532 nm "green laser pointers" which are commonly pumped by 808 nm infrared laser diodes, and also generate an intermediate 1064 nm laser beam which is used to produce the final 532 nm output. If the IR radiation is allowed into the beam, which happens in some green laser pointers, it will in general not be blocked by regular red or orange colored protective eyewear designed for pure green or already IR-filtered beam. Special YAG laser and dual-frequency eyewear is available for work with frequency-doubled YAG and other IR lasers which have a visible beam, but it is more expensive, and IR-pumped green laser products do not always specify whether such extra protection is needed.[24]​

Eyewear is rated for optical density (OD), which is the base-10 logarithm of the attenuation factor by which the optical filter reduces beam power. For example, eyewear with OD 3 will reduce the beam power in the specified wavelength range by a factor of 1,000. In addition to an optical density sufficient to reduce beam power to below the maximum permissible exposure (see above), laser eyewear used where direct beam exposure is possible should be able to withstand a direct hit from the laser beam without breaking. The protective specifications (wavelengths and optical densities) are usually printed on the goggles, generally near the top of the unit. In the European Community, manufacturers are required by European standard EN 207 to specify the maximum power rating rather than the optical density.

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