In the US (and I’m a senior AME who does a bunch of Class 1 medicals), if the airman can’t read anything in the eye chart (20/200 is the lowest resolution on my machine) we record it as such and then check them corrected. 20/20 distant, 20/40 near and intermediate corrected, and you’re good to go. Nobody here cares about uncorrected vision. Heterophorias allow +-1 vertically and <6 laterally (though we issue with a warning that the airman may get a request from the FAA for additional evaluation if they exceed those values. I am pretty sure I’ve never had an Airman who got a letter about phorias…