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本文采用二级整群随机抽样的方法,探讨了承德市居民暗适应时间正常值。提出暗适应时间随年龄增长而延长。建议正常值界值:少年儿童期为40秒,青年期为50秒,成年人为60秒。
In this paper, a two-level cluster random sampling method was used to investigate the normal dark adaptation time of residents in Chengde City. Proposed dark adaptation time increases with age. Suggested normal cutoff: 40 seconds for adolescents, 50 seconds for adolescence and 60 seconds for adults.