It starts with something that irritates the eye
, like an allergy. An irritated eye
makes more mucus to protect itself.
But some patients take to fishing out this extra, protective mucus. What happens next? Not too surprisingly, the eye is irritated by the finger-fishing and makes even MORE mucus.
Pretty soon it turns into a vicious cycle. There often is a kind of obsessive psychological component, like picking at a scab, that can make it hard for patients to stop them fishing.