UK OPITICIAN v FRENCH OPTICIAN

I had cataract surgery 21 months ago in Noyal Pontivy and laser treatment again early this year for double vision in Pontivy.  I was given a prescription for new glasses.   While I was in the UK in May I had an eye test as I felt that I was on a "conveyor belt"  when I had my check-up and laser treatment at Noyal.  I now have two prescriptions from a Nationwide Optician and the Eye surgeon at Noyal - they are totally different - so who is right and who is wrong.  If, I go to another Eye doctor in France do I have to pay for an independent check.  I do have Health Insurance and a Mutuel.   I am now struggling with my French prescription.  I had an appointment whilst in England to see the Nationwide Opticans  but I was taken ill and admitted into hospital and had to cancel their appointment as I could not reschedule.   Where do I go to now - who is right and who is wrong????Thank youSpecky 4 Eyes