Howdy Stefano,
I had mine done a few years back. One eye was 20/800 and the bad eye was 20/ worst. I had a free touch-up a year later. Now they only offer free touch-ups within 6 months. I'm about 20/40 now , so I will have it done again. The big thing that I noticed when I had it done was the brightness of colors.

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Frank X. Morris
17 Kia Niro
08 Jeep Wrangler 4 door unlimited