Collected two pairs of glasses on 31st August (tinted and plain). On return from a holiday returned glasses on 23rd September as I was experiencing double vision after wearing the plain pair of glasses. I saw a trainee who suggested I might need a prism fitted. 8th October I saw another member of staff and told them what the previous employee had explained to me but she recommended another eye test which showed my eyes hadn't changed. They noted that the arms of the frames were not properly adjusted with one side lower than the other and said that was probably the cause of the double vision problem. 12th November I told the optitian again about the double vision. She tested my eyes and said she would arrange to put prisms in both lenses. 23rd November collected tinted glasses with prisms but the tint was not as expected (ie the same as my old tinted lenses) and was too dark so they were returned the following day and the correct lenses were arranged. 6th December picked up new tinted glasses, leaving the plain ones to have the prism lenses fitted now it was clear that the prisms in the tinted lenses were suitable. 20th December picked up plain glasses with the prism lenses but the double vision persisted with them in that it took some time for my eyes to adjust to changing from distant to near vision and vice versa. On closer examination the arms of the frames were not correctly adjusted, although they were supposed to be the ones I had left for the new lenses to be fitted, and these had been properly adjusted. 21st December got arms aligned. I suffered Graves disease 14 years ago, leaving me with double vision which was rectified with surgery. I have had no double vision since then until I started wearing the newly prescribed glasses, the plain ones not being properly adjusted to fit. The manager discussed the problems with me but did not appear to accept that there were no problems until I had the new glasses, that the problem was related to a misalignment of the plain glasses (as explained by her colleague) and that I had suffered three months of impaired vision. The staff always tried to help but there was no acceptance that the new glasses were the cause of the double vision and it took four months for them to finally come up with a solution to the problem due to poor decision making. The double vision still persists when I take the glasses off and it was not a problem before the new glasses were prescribed.