They claim both “200 – 532nm O.D 6+ V.L.T 30%” and “Laser Safety eyewear has a Visible Light Transmission (VLT) of 30% and an Optical Density of 5+.”, which worries me a bit since the ‘spec’ isn’t consistent (OD is sometimes 5+, sometimes 6+, and the VLT is sometimes 30% and sometimes 50%)
That’s just one model - 3M make a bunch in various grades. I was buying the 25-pack box of 3M that looks more like the Draper, that worked out to ~100 quid per box for the classroom. As I had to wear them a lot, I bought better quality ones for myself.
If you wear eyeglasses, ou can get over-the-glasses models, too.
Thanks for the thoughts Bo. I discounted the Draper since the manufacturer says not to use them:
A: These are worn when the laser tool is weak or the laser bean is too dark, the glasses will “Enhance” the visibility of the red laser line, the are only for better visibility and NOT for protection.
I’ll take a look around the Mercateo catalogue for some 3M which cover prescription glasses. I think some purpose-sold 3M sound ideal, I tried (failing!) to Google just for that before, thanks for the lead here.
The 3M ones too, aren’t for laser eye protection, only UV and ‘high speed
particles at low energy’. They might work for the purpose if someone happens to test them, but 3M of course says ‘Do not use this product against hazards other than those
specified in this document’