新型对数视力表与“C”形对数视力表的一致性与稳定性分析

目的评价新型对数视力表与具有8个方向视标选项的“C”形对数视力表之间的一致性与稳定性。方法 横断面研究。对48例应届高中毕业生分别进行新型对数视力表与“C”形对数视力表的视力检查，采用组内相关系数（ICC）和Cronbach′s Alpha系数分析视力测量结果的重复性，采用Bland-Altman分析一致性。结果 “C”形对数视力表Cronbach′s Alpha系数在0.8以上，ICC接近0.9，新型对数视力表Cronbach′s Alpha系数接近0.8，ICC＞0.75，均显示较好的重测稳定性。2种视力表第1次和第2次视力测量均具有较好的一致性，95％一致性界限分别为（0.173，-0.133）logMAR和（0.198，-0.116）logMAR。结论 新型对数视力表检查结果稳定，和“C”形对数视力表一致性较好。

Concordance and reliability of new logMAR visual acuity chart and Landolt C logarithmical visual acuity chart

ObjectiveTo evaluate new logMAR visual acuity chart′s test-retest reliability and concordance with “C” logarithm visual acuity chart. Methods This was a cross-sectional study. Measurements using two versions of each chart design were obtained on the right eye of 48 high school students. The test-retest reliability was analyzed by intraclass correlation coefficient （ICC） and Cronbach′s Alpha coefficients， and Bland-Altman plots were used to compare the agreement between the two charts. Results The Cronbach′s Alpha coefficients of “C” logarithm visual acuity chart was more than 0.8， and the ICC was near 0.9. For the new logMAR visual acuity chart， the Cronbach′s Alpha coefficients was near 0.8， and the ICC was more than 0.75. The Bland-Altman plots displayed relatively good agreement between the two charts. The 95％ limits of agreement were 0.173 to -0.133 logMAR and 0.198 to -0.116 logMAR for the test and retest measurements respectively. Conclusion In healthy eyes， the new logMAR visual acuity chart has high test-retest reliability and good concordance with Landolt C logarithmical visual acuity chart.