In recent times, the number of patients with itchy eyes has increased in the ophthalmology clinic, and such patients: 1. Most of them have itchy eyes, red eyes, rubbing the eyes, scratching the eyes, frequent blinking, burning sensation, foreign body sensation, and photophobia and tearing, etc. 2. 2, after ophthalmology slit lamp microscopy found eyelid edema congestion eczema, conjunctival congestion, papillary hyperplasia, follicle formation, viscous secretion, a little visible corneal punctate infiltration. 3, on the eye secretion smear or conjunctival scraping or tear fluid cytology found to have eosinophils increased significantly. 4.Positive allergen skin prick test. The above characteristics can confirm the diagnosis of allergic eye disease. Allergic ophthalmopathy clinically seen in allergic conjunctivitis and allergic blepharitis. Allergic conjunctivitis is divided into seasonal, perennial, spring, macropapillary, atopic, vesicular, autoimmune and so on according to the different pathogenesis, and its clinical and therapeutic prognosis are also different. Common allergens: 1, ingested allergens: seafood, milk, fish and shrimp. 2. Contact allergens: hot and cold air, cosmetics, hair dyes, etc. 3. Inhalation: pollen, willow flakes, dust, mites, animal dander, oil smoke, exhaust fumes, etc. 3. Injected allergens: drugs, etc. 4. Self-tissue antigen. Mechanism of itchy eyes: 1, peripheral mechanism is a variety of itch-causing substances stimulate the peripheral nerve endings, transmitted to the cerebral cortex for analysis, resulting in the occurrence of itchy eyes. 2, the central mechanism is due to some of the cerebral cortex of the psychogenic activities (emotion, attention and tolerance) cerebral cortex through the nerve conduction to the nerve endings caused by the itchy eye sensation. Allergic eye disease treatment: 1, reduce the avoidance of allergen stimulation, cold compresses are effective. 2, medication, local and systemic medication. 3, psychological guidance, interrupt the central mechanism of the aggravation of eye itching. Commonly used eye drops: 1, mast cell stabilizer: sodium cromoglycate eye drops. 2, histamine antagonist: naphthamivir ophthalmic solution. 3, Glucocorticoid: cortisone eye drops. 4.Non steroidal drugs: Pranoprofen eye drops. 5, Dual-action preparations: Olopatadine ophthalmic solution or Nasuda ophthalmic solution. 6, Immunosuppressants: Cyclosporin A eye drops. 7, Traditional Chinese medicine as well as acupuncture.