Dr Pulaski offered to clone him some new eyes, but they wouldn't have the details or range that the visor does. As a Chief Engineer, I'd keep the extra visual spectrum, dude can see heat!
One of my favorite scenes from First Contact is when Barclay brings him a copper coil to look over and he literally eyeballs it going "yeah this'll do" because his eyes can see the micro fractures and imperfections in the material, something even Data can't do. I'd be pissed if someone told me they were taking that away from me!
I'd imagine it's sort of like how a lot of people prefer to wear glasses even if they're a good candidate for laser eye surgery. Personally I like how my glasses protect my eyes from debris and radiation, and I like wearing them.
I've always wondered where weed fits into this techno-utopian future. There's never any mention of anything even analogous to it. Stoners don't just stop existing when warp drive starts to.
TNG would sometimes show "poor" colonists that needed to be saved, but by in large, they never dealt with the seedier parts of humanity. The original series did have couple of episodes that fleetingly showed the more seedy parts of humanity. So I would assume the stoners where still there.
And you can't ever discount the idea that weed might have simply fallen out of favor due to different and "better" options as humans contacted other species.
With all the medical advances, you'd think there would be a significant number of really old people. Yes Picard wanted to grow old naturally. But I would think many would choose to look 25 forever.
Yes but he looked 125 and died at 125. I'm saying with the medical tech they've shown, many Federation Citizens would look 25 years old no matter how old and live virtually forever.