1. Perennial allergic conjunctivitis with seasonal allergic conjunctivitis;Dart;Trans Ophthalmol Soc UK,1986
2. Principles and practice of ophthalmology;Foster,1994
3. Abelson MB. Levocabastine rated superior for ocular allergy. Ophthalmology Times, February 15, 1992:19–20.
4. Ocular allergy;Allansmith;Clinical Allergy,1988
5. National ambulatory Medical Care Survey;Schappert,1996