The Vintage Cazal 903 Sunglasses are very rare in whatever form you find them. The cool thing about these Vintage Cazal Sunglasses is that very few knew that they could be worn as prescription eyewear. A select group of rather skilled opticians were able to cut lenses in a manner that they could slip into the backside grooves of the Vintage Cazal 903 Frame. So why sell these with a clear uni-lensed demo lens you may ask? Some believe that it was mean for racquet sports much like it's Cazal 900 series partner the Vintage Cazal 951 Sunglasses. We have many Vintage Cazal Sunglasses that are not on our Vintage Frames Shop website. Contact us directly to find out about our secret Vintage Sunglasses Vault!!!