I'm roughly 20/200 nearsighted which is mostly astigmatism. I could easily perform anything on the Private pilot non-instrument PTS without my glasses on (or I would carry an extra pair in the flight bag). Instrument would be some eyestrain from squinting but could fly it.
20/200 by itself is a meaningless number. You'd need to know if he was near or farsighted and what optical characteristics cause that.
That said, my awesome eye doc confirmed that I have the inner eye health of a 19 year old today (he can still see a macular "sheen"), but also that it's time for me to get readers for computer work and reading. Just a little less eyestrain up close. I'm slightly over corrected to 20/15 farsighted and I like it that way, but it's making the peepers work a little too hard close in.
Sooooo... For now I'll have VFR and IFR glasses. Ha. Doc says bifocals could also be done but probably not worth it at this point. A few more years.
For anyone with non-perfect eyeballs, I really can't stress how much a really really good Doc is. I can tell this guy I fly airplanes some days, shoot pistols and rifles some days, and spend 8 hours a day looking at a computer monitor and he listens and explains the options and then SHOWS me, with a set of lenses he can toss in a frame that'll give me a perfect feel for what the world will look like behind each prescription.
Been to plenty of "discount" places in my life that wouldn't do that. Never again.