In a study, people who wore glasses that inverted everything they saw were able to adapt and function normally in a few days.

This is because the human brain has a remarkable ability to adapt to some visual distortions. The first documented case of an experiment like this is from the late 1800s. A man named George Stratton ran an experiment in which he wore glasses that inverted everything he saw. He said that after a few days, he saw everything the right side up, as if he wasn’t wearing the glasses at all.

Ever since then, there have been a few attempts to replicate and tweak his experiment. The most recent one, in 1999, involved a number of students wearing similar world-inverting glasses. The results were slightly different than Stratton’s. 

Everyone involved in the study was able to adapt to their inverted vision. However, instead of their brain re-inverting their perception, participants reported that they felt as if they were walking on the ceiling or the sky. 

(Source)