Did the Concorde and the Tu-144 have darker window glass than subsonic airliners, to protect from the Sun when flying above 9/10 of the atmosphere? Or were the crew and passengers at higher risk of eye damage if looking towards the Sun from cruise altitude?
Concorde had tinted nose visor glass to withstand the heat and pressure produced at the cruise speed it could achieve. It was a laminate with a gold layer in the middle, thus the tint. I don't believe the passenger cabin glass was tinted.