昼视觉 daylight vision

互联网2013-11-14

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昼视觉 daylight vision 亦称明视。特别是指在亮处的视觉方式而言。为黄昏视觉的反义词。昼视觉时，视网膜处于明适应状态，视感度下降。在脊椎动物，视网膜的锥细胞被认为是司昼视觉的明视器（德Tagesapparat），昼间活动的动物，例如大多数鸟类和爬行类的视网膜均富有锥细胞，相反的夜间活动的动物，则杆细胞多。在低等脊椎动物，视网膜运动现象在昼视觉中起着辅助作用。在节肢动物，也同样表现为象昼行性动物复眼（并列象眼）那样视力良好的白昼视觉型和象夜行性动物复眼（重叠象眼）那样感受性高的黄昏视觉型，而且后者也具有借助于视网膜色素的移动反应，向并列象眼的昼视状态转换的能力。

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