Reddevil your optician is correct in that the lenses cannot be re coated to make them photochromatic once again. It isn't a coating, the photochromatic material is embedded into the plastic of the lens. The previous post probably fs to an anti reflection coating.
It may be possible to replace the lenses, keeping your frame, this could be expensive though depending on what type of lens it is. Perhaps you could ask your optician?
Awwww, he is so happy to see me…..