Droopy eyelids is also called lazy eye, refering to the extremely low position of upper eyelids. The droopy eyelids might be congenital or age-related. As time goes by, the upper eyelids might cover the eyeball so the vision might be impacted. In some cases, amblyopia might be resulted. While eye allergy is triggered by touching with certain allergen. The allergic reaction might make the eye red, watery and gritty, with swollen eyelids. To avoid eye allergy, you should get away from possible allergens, like pollen, dusts or pets. Once you feel you might get an eye allergy, you should flush your eyes with water at once to wash the allergens out. Get fresh air with a air purifier to filter possible allergens, especially during the changing of seasons. As to droopy eyelids, so far the only effective way is surgery to get the extra tissue removed from the eyelids.