The UK CAA is anal....
Back in '99 I failed the eyesight (-3.5 dioptres+slight astigmatism but don't quote me) for a Class 1, but a kindly old FAA AME in London (must have been well into his eighties!) passed me on a FAA medical no problem... and no scans/tests... just a quick exam.
CAA is still back in the 1950's (just like BALPA).