If the glowforge legal team won’t let them answer, the tech specs say, “Custom CO2 laser tube operating at 10,600 nm averages” so look for laser safety glasses that block around that wave length. I found some pretty quickly that block the 9000 - 11000 nm range by searching for CO2 laser safety glasses. As a bonus the site has a wide selection of very dorky and unfashionable frames, but that describes me well so I’m happy.