title: Classification of ocular atopic/allergic disorders and conditions: an unsolved problem.
abstract: OBJECTIVE
  To review the different classifications of ocular allergic diseases and to define the most suitable one according to the current understanding of the pathophysiology and clinical course of these disorders.
  
  
  METHODS
  Review of the major published ocular allergy classifications.
  
  
  RESULTS
  Based on past and present classifications, the author proposes the following classification: 1. allergic conjunctivitis (acute and chronic); 2. giant papillary conjunctivitis; 3. vernal keratoconjunctivitis; and 4. atopic keratoconjunctivitis. In addition, use of the term "allergic conjunctivitis" as a synonym for all ocular allergic disease is discouraged.
  
  
  CONCLUSIONS
  The proposed classification for ocular allergic disorders intends to unify the present criteria and to serve as an initial forum of discussion. This should enhance a common understanding among and between ophthalmologists and other allergy specialists. Constructive criticism of this classification system is required for further improvement.
authors.affiliation: Ocular Immunology Unit University of Valladolid, Spain.
authors.forename: M
authors.initials: M
authors.lastname: Calonge
mesh_terms: D003233:Conjunctivitis, Allergic / Q000145:classification*; D006801:Humans