Can anyone tell me who made the glass .? Just in interest they were the last pair that was delivered fromB &L.I think I bought them in 1988 give or take.they are pristine except for the eye cups.can't find replacements but they work foe eyeglasses .They are cracked at the point where they fold but they will work this way only for years,unless I think if you roll them up.Anyone here ever see through the glass that could give me their thoughts so I can get a base linefor comparison, I cant use them anymore to heavy.Thanks for any imput.