Are eye allergies triggered by a particular type of allergen?

ANY: "eye allergies" - watery, itchy eyes can be caused by any number of allergens - cat/pollen, etc.

Airborne allergens: Eye allergy symptoms are most often caused by airborne allergens such as tree, grass, or weed pollens, or cat dander. Any allergen that contacts the eye may also cause allergy eye symptoms. So wash your hands after you touch the cat or dog if you are allergic to them.