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.
对11例已得到病理证实的视网膜母细胞瘤的暗适应erg作了分析。其中8只眼为无波型，3只眼为降低型。
Dark adaptation ERGs of 11 cases with retinoblastoma demonstrated pathologically were analysed. 8 eyes were extinguish, 3 eyes were subnormal.
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