Interesting, thanks! I figured the thickness was just a function of physics and couldn't be changed, but I wasn't aware of the difference in refractive index.
It generally comes with more chromatic aberrations (rainbow splitting of high contrast edges / light sources), but the tech keeps improving and my current pair is only barely noticeable in my normal vision window. At the edge it basically makes text unreadable though, just because the aberrations overlap enough.
Which is much much better than like 15+ years ago, when I had a pair that had enough aberration that I was happy to get the thicker ones the next time. It was kinda fun being a walking spectroscope, but definitely uncomfortable in quite a few cases.
