I don't know Gunner's specific drama but I do know that for many years my medical had no restrictions on it but I still wore spectacles. Whilst my eyes were ok for CASA's standard, I knew my vision was improved with glasses. My approaches improved dramatically once I started wearing my specs for flying.
Of course, I knew I'd eventually get the requirement to wear specs on the medical.
Now I have the restriction to wear specs on both the CAA and CASA's medical.