Itchy, red, watery eyes are a classic sign of allergic irritation. Many environmental allergens may stimulate a negative reaction when they contact your eye. Some common allergens in Iowa include ragweed, tree pollen, grass pollen, mold, and animal dander. One way to avoid eye allergies is to avoid the allergen that causes them, but this isn’t always possible. A thorough microscopic eye evaluation is recommended to determine the best treatment plan for you.