You think if he'd gone to the charity before and said "hey, I'm going to be wearing a prototype pair of glasses to this thing, it's likely to get you a whole bu

You think if he'd gone to the charity before and said "hey, I'm going to be wearing a prototype pair of glasses to this thing, it's likely to get you a whole bunch of publicity, would you rather I took them off?", they'd have said anything other than "Hell no, keep them on"? Everyone I've ever met who works for a charity is massively pragmatic about these things. They would understand that he's not doing it to mock the blind and accepting that would very quickly move on to the potential good for the charity.