These sunglasses have the usual excellent optical quality of the Serengeti, but either the left lens is ground wrong or the frame isn't the right shape. The lens comes out of the frame about once a month. I wear them every day. The first few times I asked my optometrist to put it back in, but now I'm doing it. The small screw comes loose so I don't know how long I can put it back in. Luckily I haven't dropped the lens yet, but that's only a matter of time.
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