Thank you for your replies. I've heard about the Optrex before and this does sound useful f we are out somewhere, I may invest in some, thank you.
I too am hoping as he is so young if may either right itself or work with the Optimmune. The left eye has tear marks from the nose side of the eye now, so that may be a good sign, I don't know. The right side does not have tear staining however when playing earlier he had some clear discharge from the right nostral, the dry side. Fingers crossed.
I'm going to find out if putting him on some homeopathic tablets, Euphrasia, (eye bright), may help too.
I've also read that in human females with dry eye Omega 3 helps greatly, so I'll try adding some more fish to his diet.
He has a small amount of clear/grey mucous once or twice a day from the eyes, more from the right, but it is so little, almost like sleep.
He's so totally fully of beans though. If it were not from the dry side of the nose you would suspect nothing.
Thanks for all your advice.