I agree computerised records are best and on a practice visit are much easier to read, although it does tie up a staff member to sign in to allow clinical advisor to check each record.
PVD with other signs and symptoms I would refer but without these I would simply advise and if practice has patient leaflet if there is one.
I think biggest over referral is on slightly high IOP done on one visit by NCT, and often without a field plot, instead of following NICE guidance and repeating on a different occasion before referral. I carry a tonopen and always repeat IOP with that during exam, if I am concerned. But there are lots of things that I think experience tells you, you can manage in primary care.