目的评估3种背景环境下的中间视觉对比度阈值，并探讨暗适应时间、背景亮度和眩光对人眼对比度阈值的影响。
Object: to evaluate mesopic contrast threshold under 3 kinds of background and to explore the effect of adaptation time, adaptation luminance and glare on contrast threshold of humans eye.
目的评估3种背景环境下的中间视觉对比度阈值，并探讨暗适应时间、背景亮度和眩光对人眼对比度阈值的影响。
Object: to evaluate mesopic contrast threshold under 3 kinds of background and to explore the effect of adaptation time, adaptation luminance and glare on contrast threshold of humans eye.
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