I have been wearing the Harness Model since 2015. My last two pairs have been prescription. I had cataract surgery recently and had one eye done for reading and one for distance thus I needed prescription to be able to see my best. I used to work for a company that coated the lenses for Revo back in the mid 1080's in California. I was responsible for quality control of the process. I learned that Revo was one of the best brands for protecting your eyes with their special coating. I routinely tested all of Revo's competitors to see how they compared spectrally and found that no one at that time came even close. I have worn nothing else since then. Great job!