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      Classification System for Cataracts

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          A cataract classification and grading system for the main purpose of cataract epidemiological studies is proposed by the Japanese Cooperative Cataract Epidemiology Study Group. Cataractous types are classified principally into cortical, nuclear and subcapsular opacities. Stages of cataract advancement are classified into grade I (early stage), grade II (moderate stage) and grade III (advanced stage). Regarding cortical opacities an opacified area obtained from red-reflex images is utilized for grading judgment. Nuclear opacity grading is based on the intensity of scattering at the nucleus. Grading of subcapsular opacities is judged from their extension in the three different pupillary areas. To help grading judgments, standard pictures of cortical and nuclear cataracts are provided. Gradings of lens coloration are divided into pale yellow (grade I), yellow (II), brownish yellow (III) and brown including reddish and black brown (IV). A recording chart is also provided.

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          Author and article information

          Ophthalmic Res
          Ophthalmic Research
          S. Karger AG
          10 December 2009
          : 22
          : Suppl 1
          : 46-50
          Department of Ophthalmology: aKanazawa Medical University; bTokai University; cKyorin University; dDokkyo University School of Medicine; eKoshigaya Hospital, Dokkyo University School of Medicine; fKyoto Prefectural University of Medicine; gFukushima Medical College; hSecond Tokyo National Hospital; iSendai National Hospital, Japan
          267064 Ophthalmic Res 1990;22:46–50
          © 1990 S. Karger AG, Basel

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          Page count
          Pages: 5
          Classification, Monitoring and Evaluation of Cataracts


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