Hey, there. Eye allergies are also known as "allergic conjunctivitis". They may be caused by a misfiring of the immune system. When there is something disturbs you, the natural defense mechanism of your body will react. Your allergies may be caused by pollen from grasses, weeds, and trees. This can be called seasonal allergic conjunctivitis. If your allergies are caused by dust, pet dander, or other indoor allergens, you can avoid such objects. If your allergies are caused by makeup, perfume, or other chemicals, I think you may need to change another brand or avoid using them. If you really don't know what to do you can consult your eye doctor.