Itchy eyes after contact with cats are usually considered to be caused by cat hair, or some bacteria or dust on the cat’s body. A general eye allergy is usually an allergy to the conjunctiva, called allergic conjunctivitis. Generally allergic conjunctivitis is mainly itchy and is usually treated by anti-allergic means. The most commonly used medication is Olopatadine drops, which is an antihistamine and mast cell stabilizer that works quickly and lasts a long time. It is used 2-3 times a day for about a week to stabilize the itch. If the itch is persistent, you can also continue to use it for 2-3 months without too many side effects. If Olopatadine doesn’t work, you can use hormonal drops, such as Flumilon or Dexamethasone, which can usually achieve the effect of stopping itching in about a week, and then switch to Olopatadine to maintain it, which is relatively effective and safe.