Oakleys - my first pair were mind boggling expensive something like 18years ago
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Battered, been super glued a few times single vision but served me well on a £s/use basis they ended up costing me nothing and I still use them - prescription is still more more or less what I have now for medium and distance - more than good enough for driving or as gash for water sports
However, they were getting on a bit and I really needed varifocal for map reading, gps etc - so
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Expensive - but probably the last pair of cycling sunglasses I will buy - Absolutely excellent - varifocal - supposedly the lenses were stamped out individually for my prescription - only drawback I can find apart from the price is that they are polaroid which means that everytime I hold my camera up in a portrait sort of way I think the camera is not working