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 human s 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。