Most likely you'd spread some diseases that we're all immune. You wouldn't even explain how did you get there and that you're not a heretic due to the language barrier, so probably end up burned alive or something.
Those diseases also work the other way around. Your only small defence would be better hygiene and they would probably think you were somehow wrong in the head for constantly washing youself.
A pale, well clean and curated guy with strange dresses (rich) who show up suddenly alone with no luggage or horse (alone), talking some foreign language (stranger).
Depending from the periods and the location, the two more likely scenario would be either to be robbed and killed/sold-as-slave or be arrested and put in a jail for interrogation.
“So here’s a bunch of really cool stuff you can do once you have better steel”
“How do we make that”
“Fuck if I know, I’m an engineer not a chemist. But if you get one here’s a cool thing you can do with plastic called injection molding, it’ll poison your water though”
Best chance pretend to be a mute and blend in the best you can. Gonna be a bit hard to keep the glasses if you are dependent on them, maybe just become good at making glasses seems like a good trade especially for the time period I dont think glasses were really around for awhile I'll have to do some research
Lenses good enough to work as glasses wouldn’t’ve been available until the Renaissance. But Roman’s did have glass so learning to make lenses and the tools to make it would work