Nnngh. *pinches bridge of muzzle, beneath rapidly and poorly repaired glasses* I propose an OpenGlasses. The specs spec, if you will. Skeleton frame and arms, substantial adjustability and customizability across three standard deviations of humanoid head sizes via captive hex nuts/tapped holes and M1 hex-head bolts. Cheap to manufacture as backup frames for any lens. Flexible lens mounting strap? Screw mounts? Friction fit?
Mmnph.
Revisit when eyes not trying to unscrew selves from head. >.<