I was looking for what chemicals one is exposed to when working with glass/melting glass etc. and came upon this site.
http://www.eastfallsglass.com/safety.php
It mentioned several nasty chemicals you could potentially breathe (all the more reason to make certain to have superior ventilation and possibly wear a mask).
And it also mentioned that regular didy glasses do not protect against IR which is infrared radiation and it causes cataracts. I believed didy glasses to be all that was required? And if they are not what are you supposed to use in combination with them? But maybe it was referring to plain old fashioned rose didymum glasses. The newer ACE - 202 aren't the same I don't think.
I did also find this about ACE-202 lenses:
"Known as Phillips 202, or one of several other trade names, ACE is the name Schott calls their most popular lampworking filter lens. ACE exceeds light filtering in the UV (ultra violet), near IR (infrared) and sodium flare spectrums than the old rose didymium lenses. Sodium flare is the bright yellow orange light that hot glass produces while in the flame, It is also what irritates and fatigues your eyes the most. In addition, ACE color enhances red, blue and green, making it easier to see a glass' true color and judge its temperature while you work."