Watery right eye from few months

[raptors]

We have 2 cats both 4 years old, the girl cat has been having trouble with her right eye. Her eye gets watery, sometimes even pinkish around the eye and smaller than the left eye. It's random in the sense that she gets it once all most every day for couple of hours and this has been happening for 3-4 months now. We took her to a vet who gave an eye ointment but it didn't help, took her to a 2nd vet who said all seems fine (she was fine when we took her to the vet) and asked to use the ointment if it happened again. Please suggest. Thanks.