Bernard Morin, a successful topologist who was part of the team that exhibited the first sphere eversion, was blind since age 6.
Pretty incredible to do this sort of stuff with no visual aids at all.
https://en.wikipedia.org/wiki/Bernard_Morin
@ayegill I'd argue that while impressive work, it shouldn't be surprising that he was able to at all, but rather that this is the very reason he was able to; his visualization capability wasn't anchored to 3 dimensions and was freer than most
a Schelling point for those who seek one