I’ve just had a call off the CAA about this very problem, I am at 2.00 dioptres at the mo & I thought that was the max but it is, as said, 3.00 dioptres & the CAA can issue a cert with experience? I think this means providing you already fly?
No help to your situation though?
I would recommend a good look through Lasors to give you the correct information as this will effect everything in your flying, or do what I did and e-mail the medical division of the CAA!
Good luck
YYZ