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I think the following will answer your question;
Custom Designed Hazardous Industrial Safety Spectacle Kits
Spectacle frames are interchangeable with any Altek mask insert
Custom designed mask insert for easy inserting and removal
Currently fits Cairns, Drager, MSA, Scott & Sperian/Survivair
Detachable or tuckable two piece adjustable head strap
Dual capability for use inside and outside of mask
Will not break mandatory mask seal
Patented Snap-On / Snap-Off System
Meets NIOSH, OSHA and Z-87 Safety Standards