Blind Glasses are glasses that allow the wearer to not see anything and the jokers use these for challenges.
While wearing the dark glasses, the Joker must do everything said by the other guys. The other guys have to navigate the "blind" joker and then tell them what to say and do. The Joker either does this command or he refuses, getting a loss. Then he will take off the glasses, looking at who or what he had done it to It is the best challange. The Blind Glasses would also be used for Sal's scared straight punishment.