English Translation
Without my glasses, I can’t see squat.
Literally, “not see three on a donkey”. The story goes that in the beginning of the 20th century in Andalusia, to test someone’s sight, a person was given a photo with three people sitting on a donkey. If the person could not make them out, they would have been declared to have had bad sight.
https://en.m.wiktionary.org/wiki/no_ver_tres_en_un_burro#Spanish