Is LEA symbol better compared to Snellen chart for visual acuity assessment in preschool children?

Is LEA symbol better compared to Snellen chart for visual acuity assessment in preschool children?
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DOI：
10.22336/rjo.2019.7
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发表时间：
2019-03
期刊：
Romanian Journal of Ophthalmology
影响因子：
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通讯作者：
U. Vivekanand;Sarita R J Gonsalves;Shailaja Bhat
U. Vivekanand;Sarita R J Gonsalves;Shailaja Bhat
中科院分区：
其他
文献类型：
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作者：
U. Vivekanand;Sarita R J Gonsalves;Shailaja Bhat

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目的：比较3-5岁学龄前儿童莱亚符号视力表与Snellen E视力表的视力差异。患者和方法：纳入标准：50名3 ~ 5岁的正视儿童。排除标准：斜视、弱视、屈光不正和任何器质性眼病。采用假随机方案，使用Snellen E视力表和莱亚符号视力表，对每位受试者双眼进行单眼视力（VA）测试。两个视力表的视敏度评分为儿童正确识别最大4个视标中的3个的最小视标尺寸。使用类间相关系数（ICC）测试两个图表之间VA的一致性强度。采用Mann-Whitney U检验比较两组。结果：男孩：女孩= 26：24，平均年龄和标准差为4.12 ± 0.79岁。Snellen和莱亚符号图之间的ICC分别为0.256和0.213。使用Mann-Whitney检验对两个样品进行分析，显示两个图表之间存在显著差异（p值<0.000）。结论：莱亚符号测试显示与Snellen E视力表的视力测量结果仅相当一致。莱亚符号视力表的视力测量结果明显高于Snellen视力表。
Aim: To compare visual acuity using the LEA symbol chart with Snellen E test chart in preschool children of age 3-5 years. Patients and methods: Inclusion criteria: 50 emmetropic children aged 3 to 5 years. Exclusion criteria: Strabismus, amblyopia, ametropia, and any organic eye disease. A pseudo randomized protocol was used to test visual acuity (VA) in each subject monocularly on both eyes using Snellen E chart and LEA symbol chart. Visual acuity for both charts was scored as smallest optotype size which the child correctly identified 3 of maximum 4 optotypes. The strength of agreement on VA between two charts was tested using Interclass correlation coefficient (ICC). A Mann-Whitney U test was applied to compare both the groups. Results: Boys: Girls = 26:24 with a mean age and standard deviation of 4.12 + 0.79 years. ICC between Snellen’s and LEA symbol chart was 0.256 and 0.213 for right and left eye respectively. Analysis of the two samples using Mann-Whitney test showed a significant difference between the two charts (p value <0.000). Conclusion: LEA symbol test showed only a fair agreement with Snellen E charts for visual acuity measurements. Visual acuity measurement with LEA symbol chart showed significantly higher scores as compared to Snellen’s chart.