Various corrective surgeries for vision over the years have intentionally mismatched focal distance between eyes. Presumably there are at least tens of thousand

Various corrective surgeries for vision over the years have intentionally mismatched focal distance between eyes. Presumably there are at least tens of thousands of people that can only read up close with one eye, and at a distance with the other. I personally was born with a crossed eye. It's been corrected, but the reading acuity of my secondary eye is worse than my primary. Everything is in focus optically, but reading is more strenuous. It's almost as if there's some letter or syllable sized gaps my brain is interpolating around. Perhaps I only notice it when reading because of the density of high frequency content in all the letters.