網膜色素変性における色誤認

Faulty color recognition by patients of retinitis pigmentosa

要約　目的：後天青黄色覚異常がある網膜色素変性患者の色認識の検索。方法：網膜色素変性患者6例12眼を対象とした。パネルD-15検査で全員に後天青黄色覚異常があった。年齢は36～68歳（平均50歳）で，矯正視力は0.4～0.9の範囲にあった。53枚の色票に対する色名呼称検査で色誤認の型を分析し，日常生活での色誤認につき聞き取った。結果：色名呼称検査では，12眼が青を黒，11眼が青を緑，10眼が黄色を白，7眼が茶を紫，7眼が紫を茶，3眼が緑を青と誤認した。色覚異常の自覚はあいまいであったが，よく聞くと色誤認を経験し生活に支障がある例があった。結論：後天青黄色覚異常は網膜色素変性患者の視機能障害の1つであり，これに関する具体的な生活指導が望まれる。

Abstract.　Purpose：To evaluate faulty color recognition in patients of retinitis pigmentosa. Method：This study was made on 12 eyes of 6 patients with retinitis pigmentosa. All had blue-yellow defects when examined by panel D-15 test. Their ages ranged from 36 to 68 years,average 50 years. Their corrected visual acuity ranged from 0.4 to 0.9. Each eye was examined by color-naming method using 53 color cards. They were intervied regarding faulty color recognition in daily life,Results：By color-naming method,yellow was recognised as white by 10 eyes,blue as green by 11 eyes,blue as black by 12 eyes,green as blue by 3 eyes,brown as purple by 7 eyes,and purple as brown by 7 eyes. Inconvenience in daily life by faulty color recognition was occasionally felt by the patients. Conclusion：Acquired blue-yellow defect is one of visual disorders of retinitis pigmentosa. We advocate due counselling to affected patients.