The most common allergens for patients with allergic conjunctivitis are mites, pollen, animal dander, contaminated food, such as allergy to wheat flour: 1, mites are small bugs invisible to the naked eye, eating dead skin on the human body for a living, especially on the bed sheets and covers at home, and not easy to remove, it will repeatedly reproduce; 2, pollen including spring pollen and fall pollen, spring pollen is mainly tree pollen, including poplar, willow The spring pollen is mainly tree pollen, including poplar, willow, and acacia trees. Autumn pollen is most commonly weed pollen, like Artemisia pollen and humulus; 3, animal dander is when the family keeps pets, there will be animal fur and animal dander off, which can cause allergies and symptoms; 4, Yantai is located in a coastal city, the air is humid, especially in summer, mold allergies are more. Sometimes smelling a musty smell at home is some mold spores scattered in the air, which can easily cause allergies, causing itchy eyes, sneezing, runny nose, and also allergic dermatitis. Therefore, the home often open windows and ventilation, less flowers, because more flowers and trees, the home is easy to damp, soil rot, branch rot are easy to breed mold.