Allergic conjunctivitis is an acute or chronic recurrent disease, and complete eradication is often very difficult. Both seasonal and perennial allergens can trigger an allergic immune response. Seasonal allergens include: tree pollen, grasses, weed pollen and outdoor fungi. Perennial allergens include dust mites, indoor fungi, and animal dander (mostly cats and dogs). The most common symptom of allergic conjunctivitis is itchy eyes, which can occur in almost all patients with allergic conjunctivitis, with springtime keratoconjunctivitis usually showing the most pronounced manifestation. Other symptoms include tearing, burning sensation, photophobia and increased secretions. The secretions are mostly mucus-based. Some of the more severe allergic conjunctivitis, such as springtime keratoconjunctivitis and atopic keratoconjunctivitis, can sometimes present with vision loss. Dissociation from allergens is the most desirable and effective treatment. Contact with possible allergens should be avoided as much as possible. For example, remove rags and blankets from the room, pay attention to bed hygiene, use insecticides to eliminate insect mites from the room, avoid contact with grass and tree flowers during the pollen transmission season, and stop wearing or replace quality contact lenses and care solutions. Cold compresses on the eyelids can temporarily relieve symptoms. Allergic conjunctivitis must be cured by identifying the definitive allergen and avoiding contact with it, or by desensitization therapy.