I bought a Ray Ban sunglasses model 4085 in one Dubai duty free store for about US$180 2 years ago. I was using the sunglasses in normal use when suddenly I noticed a small crack developing near a small screw holding the glass.
Then I noticed overtime that the crack became longer up to 1cm.
When I was in one Houston factory outlet, I was window shopping. I saw the same sunglasses of the same model in one store with a crack also.
I concluded that it was Ray Ban factory defect.
What a waste of money. So beware!!

Picture attached