Crowding Ratio in Young Normally Sighted Children
Crowding Ratio in Young Normally Sighted Children
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DOI：
10.3109/09273972.2012.680233
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发表时间：
2012-01-01
期刊：
影响因子：
0.9
通讯作者：
van Genderen, Maria M.
中科院分区：
文献类型：
--
作者：
Dekker, Marjoke J.;Pilon, Florine;van Genderen, Maria M.
目的：为确定儿童拥挤比（CR）的正常值，对62名4-12岁视力正常的小学生进行了远、近视力CR测定。使用基于莱亚符号的常用测试图表进行检查。结果：对于所有< 2.0岁的患者，近距离CR均显著优于远距离CR。远距离CR的上限为< 2.0 from age six.Conclusion: With commonly available tests the CR can easily be determined in school age children. For children >6岁，CR > 2.0（即，e.单次视力检查和直线视力检查的结果之间至少有3条直线的差异）是可疑的，需要进一步调查。例如，它可能是大脑视觉障碍（CVI）的标志。
Purpose: To determine normal values of the crowding ratio (CR) in children.Methods: Of 62 normally sighted primary school children aged 4-12 years old the CR was determined both for distance and near vision. The examinations were performed using commonly available test charts based on the LEA symbols.Results: At near, the CR was significantly better than at distance and for all ages < 2.0. The upper limit of the CR at distance was < 2.0 from age six.Conclusion: With commonly available tests the CR can easily be determined in school age children. For children > 6 years of age, a CR > 2.0 (i. e. at least 3 lines difference between the result of a single optotype acuity test and a line acuity test) is suspicious and warrants further investigation. It may, for example, be a sign of cerebral visual impairment (CVI).