I’ve not used them much yet and never for driving- I haven’t seen any improvement yet with the differentials alone so have held off as normalised appeared later in the course. I found it easy enough to see clearly with normalised but wanted to follow the steps exactly (and they still gave double vision at the centre distance when I put on my full strength glasses).
I’m getting another eye test tomorrow just to make sure everything’s still correct. If its changed, I’ll get a new pair of differentials and normalised. Would you suggest that if I can see clearly enough (legal level, and no double vision) with normalised I should use those for driving instead of my full strength glasses?