Evaluation of severity of the color vision defect using the Ichikawa lantern test in anomalous trichromats

DOI 12 References
  • Onodera Asami
    Department of Ophthalmology, The Jikei University School of Medicine
  • Hayashi Takaaki
    Department of Ophthalmology, The Jikei University School of Medicine
  • Kashiwada Teiko
    Department of Ophthalmology, The Jikei University School of Medicine
  • Kitakawa Takaaki
    Department of Ophthalmology, The Jikei University School of Medicine
  • Takeuchi Tomokazu
    Department of Ophthalmology, The Jikei University School of Medicine
  • Kubo Akiko
    Department of Ophthalmology, The Jikei University School of Medicine
  • Urashima Mitsuyoshi
    Division of Clinical Research and Development, The Jikei University School of Medicine
  • Tsuneoka Hiroshi
    Department of Ophthalmology, The Jikei University School of Medicine

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Other Title
  • 市川式ランタンテストによる異常３色覚者の程度判定に関する検討

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Purpose: To evaluate severity of the color vision defect using the Lanthony desaturated panel D-15 test (desaturated test) and the Ichikawa lantern test (lantern test) in anomalous trichromats with congenital red-green color vision defects.<BR>Methods: We examined 159 anomalous trichromats including 53 protanomalous trichromats (PA) and 106 deuteranomalous trichromats (DA), diagnosed by a Nagel model I anomaloscope. All participants had the pass results in the Panel D-15, 1.0 or better of corrected visual acuity and no ocular disease. Lantern pass (good result) was defined as error numbers of 3/9 or less, whereas lantern fail (poor result) was defined as error numbers of 4/9 or more. The desaturated test pass/fail results were compared between lantern good and poor results using a Fisher’s exact test or chi-square test (with significance at p<0.05).<BR>Results: In PA (n=12) with good results of lantern, 11/12 had the pass results and 1/12 had the fail results in the desaturated test. In PA (n=41) with poor results of lantern, 24/41 had the pass results and 17/41 had the fail results in the desaturated test. The good-result ratio in the lantern was significantly (P=0.03) high in PA with pass results in the desaturated test. In DA (n=36) with good results of lantern, 33/36 had the pass results and 3/36 had the fail results in the desaturated test. In DA (n=70) with good results of lantern, 56/70 had the pass results and 14/70 had the fail results in the desaturated test. The good-result ratio in the lantern was high in DA with pass results in the desaturated test.<BR>Conclusion: Anomalous trichromats with good results of lantern may have milder severity of color vision defect than those with pass results of the desaturated test.

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