Bramble gets it too - I have looked at her eyes very carefully, as there a loads of problems you can get with the eyes, like
Entropion - eyelids that roll in
Ectropion - eyelids that roll out and other problems.
I think they are prone to watery eyes, though, but I'm no expert, just what I have read and heard. Most of the other Cockers we know have weepy eyes too.
If the eyes look at all sore though, its worth getting checked out by a vet.
My cocker "bible" is "Cocker Spaniel - an owner guide" by Lesley Scott-Ordish. I have found it really helpful.
Hope its just "one of those things" and nothing serious.