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要約 目的:進行した網膜色素変性患者に赤いリンゴの写真を呈示し,色相の再現を試みた。対象と方法:対象は網膜色素変性を伴う3例である。年齢は40~57歳,矯正視力はそれぞれ指数弁と0.03,両眼とも手動弁,0.03と0.1である。5個のリンゴが茶色のかごに入っている写真を呈示し,10段階のトーン記号,12種の色相記号,6段階の明暗を組み合わせた色彩での表現を試みた。結果:正常者は両眼による観察で,3個を赤色(R3vv)(60%),2個を橙色(R3lt, Olvv)(40%)と判断した。患者は両眼もしくは左右眼それぞれの観察で,5個のリンゴを紫,緑,黄色,肌色,褐色と判断し,ごく稀に赤と認識した。結論:黄斑に変性がある網膜色素変性では,長波長のL錐体,中波長のM錐体,短波長のS錐体が障害され,無彩色で観察している可能性がある。
Abstract. Purpose:To report the state of color vision in patients with advanced retinitis pigmentosa. Cases and Methods:This study was made on 3 cases of retinitis pigmentosa. The age ranged from 40 to 57 years. Corrected visual acuity was counting fingers and 0.03,hand motion in both eyes,and 0.03 and 0.1 respectively. They were presented with a photograph showing 5 apples in a brown basket,and were asked to name the color of each apple as a numeric combination of tone,hue and brightness. Results:Healthy persons identified 3 apples as red(R3vv)(60%)and 2 apples as orange(R3lt,Olvv)(40%). The patients described,by monocular observation,the color of apples as purple,green,yellow,orange and,occasionally,as red. Conclusion:Patients with advanced retinitis pigmentosa with macular involvement may be affected by impairment of L,M and S cones resulting in seeing colored objects as monochromatic ones.
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