The bit I don't like is the double standard whereby all sorts of things are permitted on a RENEWAL medical (in Europe) with a Demonstrated Ability test, which are not permitted on an INITIAL medical.
It is a crude measure to keep people out of flying, while protecting airline pilot jobs as the subjects get older and start to suffer various things like a loss of hearing or eyesight going outside the initial uncorrected limits.
If one could allow DA on all the things on which it is possible on a renewal medical. many more people could be flying.
Many more European pilots could also do the IR.
The colour vision tests are a real joke, too.