[SSSAlfa]

I agree with Deven Patel, there should be no difference but find some people like -0.50DS can read 6/6 unaided which if they were in a 6m room they would be 6/9-6/7.5 unaided. If they can read further down, this means their VA’s are wrong, so for example if they can read 6/12 in a 3m room they would pass the DVLA requirements. But if they were tested in a 6m room they prob be 6/18 or 6/12- so would fail. So what do you do?