Hi henrys how are you
if you had an eye test with a certified optician you will probably be okay, did they try to sell you an over priced pair of specs/ you can take that prescription anywhere you know, go to specsavers they are good.
D and A are good. had mine tested the other day. Would'nt advise getting glasses made up where not prescribed in case prescription slightly wrong. I think they guess anyway. Can you see green circles can you see red circles is that better etc. Bit of a con I reckon.