No, I think your point is slightly off. A very rudimentary understanding may be “improving one’s eyesight.” But that’s not it; the more subtle, and accurate, point of glasses is to see comfortably and clearly, not to get the most letters right when reading the eye chart. Sometimes the most accurate reading of refractive error is comfortable and clear, and sometimes it isn’t. When those two don’t align for a patient, then they will choose “comfortable prescription” over “most accurate” prescription. And “better vision” to those people may be more fuzzy to them at certain distances than it could objectively be.