Depends upon your outlook, but remember there is no requirement to actually have a valid medical whilst undergoing training. This therefore, means you can complete the training elements and then once the medical issue is resolved finish the hour building and skills tests.
Obviously, if at the end you don’t get the medical decision then that’s money down the drain.
Unlikely, I know, but different Countries have different standards and the, for argument sake, eyesight requirements under one authority may be less - depends upon the medical condition.
Years ago I went to the CAA and failed initial issue hearing. The doc gave me the work around which was to get a foreign CPL and then they’d assess me to renewal standards (which I met) even though it was an initial issue of a JAA certificate. Not sure that loophole is still open.