Long Final - I suggest you take up the problem thus:
1) With a good optomotrist (optician as they usd to be known), explain that you need corrected vision to the requirements of a CAA class one medical, and they should be able to sort you out.
then,
2) Go and see your local AME, most of them are fighting to understand JAR requirements themselves, and the issue of a class one with regard to eyesight seems to be open to interpratation.
The AME may well refer your case to the CAA medical branch, and obviously they have the power to overide the AME's decision either way.
That said, as an ATCO, I've always found them very helpful and approachable, and they are prepare to work alongside you rather than against you.
Good Luck.