Thanks for all your replies
Robbie, I'm sorry that Optimmune didn't work for Charley. Is he adapting well? My first Cocker gradually lost his sight when he was old but coped very well. I think in his case it helped that he had already slowed down quite a lot so wasn't still trying to rush round everywhere.
Lindsey, I'm absolutely sure that William's raw diet has helped with his health generally in a big way. He no longer has itchy skin (apart from one small area on his throat), no lip fold infections, no ear infections and usually does perfect poos
, all of which makes me think that his body and immune system must be in better shape than they used to be, so perhaps it's also helped with the Dry Eye as his is the autoimmune type where his system is trying to destroy his tear ducts.