Well, I am still working on a respirator. Because I have "O" experience with full respirators I have emailed 3 companies with questions but am not getting any replies. So educate me :)
Does an eye doctor fit lenses into these spectacles?
How do they attach to the respirator or do they attach to the head?
If attached to the respirator do they move the lenses away from the eye? (If so this is not good :(()
How are they adjusted if knocked off center when installing the respirator?
I am not understanding the different designs (If I was smart enough I would attach photo's but I ain't) Some have some sort of bracket right where my nose would be which is why I asked if the lenses were pushed forward. Others have thin wires similar to "hoop" style temple wires which is why I ask if they are attached to the respirator or the ears.
I am pretty much out of the kayak business until I solve this problem as my eyes won't tolerate any more epoxy dust.

Here's a link to one supplier of quality full face respirators, this link showing the frames for your lenses:
http://solutions.3m.com/wps/portal/3M/en_US/GovernmentSolutions/Home/ProductInformation/ProductCatalog/~/3M-Full-Facepiece-Respirator-6000-Series-Parts-and-Accessories?N=8702286+4294887056&rt=d

Their products are not cheap, but they are good. They make a variety of filters and canisters to fit their respirators. You can mount a pair of particulate filters only, to use when you are sanding. You can mount a pair of organic vapor filters for working on epoxy, or you can stack filters and cartridges when that is appropriate. They are sold by distributors and retailers who carry safety equipment. Shop on the internet to find the best prices.

You'd take the spectacle frames and your eyeglass prescription to an optician or to your optometrist to have lenses ground and mounted in the frames. Once the spectacles are mounted in the respirator and adjusted to fit you, they should not have to be messed with again, except to clean them.