对比因素对儿童分辨物体细节能力的影响
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【摘要】 目的 观察对比因素对儿童分辨物体细节 能力的影响，了解儿童对比视力的状况。方法 使用对比视力表，测量 53名裸眼视力≥5.0的正常儿童92%，52%，30%对比水平处的对比视力。结果 儿童的对比视力随对比度的降低而显著下降，对比度与视力之间存在显著相关；左 、右眼的对比视力差异无统计学意义；男性和女性的对比视力差异无统计学意义。 结论 低对比的学习环境会增加儿童视觉负荷，在防治学生近视过程中应引起重 视。
【关键词】 视力测定法；对比研究；观察；儿童
【中图分类号】 R 179 R 770.42 【文献标识码】 A 【文章编号】 1000-9 817(2007)10-0911-02
Effect of Contrast Visual Acuity on Children's Ability to Identify the D etails of Objects/ SHI Fen-zhou, TIAN Li, WANG Jue. Naval Medical Resea rch Institute, Shanghai(200433), China
【Abstract】 Objective To observe the effects of contrasting f actors on the ability of children to identify the details of objects, and to kno w the sitution of children's contrasting eyesight. Methods Fift y-three children with normal visual acuity>5.0 of their contrast visual acuitywere measured in the position of 92%,52% and 30% contrast horizontal point by co ntrast visualacuity chart. ResultsThe visual acuity of this group of child ren had an obvious reduction with the decrease of the contrast level; the visual acuity was closely related to contrast level; there was neither distinctive diff ere nce between left and right eyes of their contrast visual acuity; nor between mal e and female ......
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