Mrs Salad was becoming very troubled by double vision. So much so, that she had stopped driving as she was seeing two of everything, and not particularly close together.
She booked an appointment with Specsavers, who urged her not to order any new glasses straight away, whilst they booked for her to see a hospital opthalmologist.
It took about three months for the appointment to arrive. The opthalmologist did lots of tests, far more than a normal eye test, and declared that Mrs S needed glasses with "prisms" built in. Initially she gave Mrs S a clear plastic thing that adhered to one lens of her existing glasses. It looked like a series of tiny vertical blinds, which approximately corrected Mrs S's vision. She also sent Mrs S for a precautionary brain scan (insert your own jokes at this point!) and made another appointment for a couple of months time.
The brain scan ruled out any nasty causes for the double vision, and confirmed it was a problem only with the eye muscles.
A second set of extensive tests saw Mrs S leave the hospital with a prescription detailing not only the usual figures for lens eyesight correction, but also the amount of prism correction for each eye.
Back to Specsavers for a new pair of glasses. She chose mid priced frames, with reactolite lenses and the prism correction, and the whole bill was about £140. Not very dear, considering the specialised nature of the lens correction which was included. To be honest, I would have gladly stumped up three or four times that much if it meant that she could see properly once again. Now, she is back to driving and is no longer plagued by double vision. It hasn't stopped her "back seat driving" when I'm behind the wheel!
Moral of the story: it was a referral from Specsavers that kicked the whole process off...... Our local one was very helpful indeed.