視認対象の条件悪化に伴う先天色覚異常の色誤認の増加

Increase in false color perception by congenital color deficient persons following aggravation of environmental factors

要約　目的：先天色覚異常による，視認条件の悪化に伴う物体色の色誤認の変化の検討。対象と方法：15～39歳の343人を被検者とした。内訳は，1型2色覚51人，2型2色覚116人，1型3色覚51人，2型3色覚82人，正常色覚43人である。中彩度低明度の12色相の色票で作成した，30mm×30mmの正方形（A票）と直径5mmの円形（B票）の2種類に対する色名呼称検査をした。結果：誤答率はいずれの型でもA票よりB票が高く，異常3色覚のB票では2色覚のA票と同等であった。結論：先天色覚異常では，低明度対象に対する誤答率は2色覚・異常3色覚とも小視角の場合に有意に増加する。異常3色覚でも視認条件の悪化で色誤認が増えることには注意が必要である。

Abstract.　Purpose：To report changes in color confusion in congenitally color deficient persons following aggravation of environmental factors. Cases and Method：This study was made on 343 persons. The series comprised 51 protanopes,116 deuteranopes,51 protanomalies,82 deuteranomalies,and 43 persons with normal color vision. Their age ranged from 15 to 39 years. They were asked to name the color of square samples of 30 mm×30 mm in size（A）and circle samples of 5 mm in diameter（B）. The samples had 12 kinds of hue of middle chroma and low luminosity. Results：The rate of false answer was higher for samples B than A of every type of color vision. The rate of false answer for samples B of anomalous trichromats was nearly equal to that for samples A of dichromats. Conclusion：Rate of false answer increased significantly flow low-luminosity samples by dichromats and anomalous trichromats. Rate of false color recognition increased even in anomalous trichromats in aggravated conditions.