An eye allergy is an allergic reaction to an allergic substance on the surface of the eye. With an eye allergy, your child will have itchy eyes, increased tearing, mild swelling of the eyelids and pink eyes. An allergic reaction can occur whenever they come in contact with his or her eyes.Common allergens that cause eye allergies include pollen, dust, mold, animal hair, eye makeup, pet dander or another substance. So you need keep any animals that trigger eye allergy symptoms out of your home-or at least keep them out of rooms he or she spends a lot of time in, such as the bedroom. And also you should pay attention to wash bedding in hot water every seven to ten days.