Designer sunglasses have one thing in common, they need to be "out there", "wachy", "bright", "big" or "different", but in all cases the logo needs to be seen. This is where the big designers have got a little clever, instead of a little logo brand on the glass or on one or both of the arms, they are trying to hide them, not because they don't want you to see them, but they realise that everyone is curious in which brand they are and of coarse the more suttle the cooler.
Its interesting to see how reverse advertising is working so well for this sector, I wonder if this will continue on other logo centric products?