智能视力表投影仪的可重复性及其与传统视力表的比较

Repeatability of Intelligent Visual Acuity Chart Projector and Its Comparison with Traditional Visual Acuity Chart

目的:分析智能视力表投影仪在视力检查中的可重复性及其与传统视力表测量结果的比较。方法:系列病例研究。收集2022年1月4—22日在首都医科大学附属北京同仁医院就诊的眼部不适患者60例(120眼)。先通过智能视力表投影仪(LSJ-IVAC-6000A)对患者进行3次视力检测,并采用组内相关系数(ICC)评价3次测量结果之间的可重复性;再用传统灯箱的国家标准视力表测量1次,并分别采用ICC和Bland-Altman图表法分析智能视力表投影仪与传统视力表检测结果的一致性。结果:同一受检者右眼、左眼使用智能视力表投影仪测量3次的ICC值分别为0.830和0.868,双眼的ICC值均>0.8(P<0.001);同一受检者右眼、左眼使用智能视力表投影仪和传统灯箱的国家标准视力表测量的ICC值分别为0.846和0.873,双眼的ICC值均>0.8(P<0.001)。右眼、左眼使用智能视力表投影仪和传统灯箱的国家标准视力表测量差值的95%一致性界限分别为-0.25~0.20和-0.24~0.17。结论:智能视力表投影仪的可重复性较好,与传统灯箱的国家标准视力表的测量结果相比一致性较强,应用于临床工作中可提高视力筛查的效率并节省人力和物力。

Objective:To analyze the repeatability of intelligent visual acuity chart projector in measuring visual acuity,and its comparison with the outcomes of traditional visual acuity chart.Methods:This case series study included 120 eyes of 60 patients with ocular surface diseases who visited Beijing Tongren Hospital,Capital Medical University from 4 to 22 January 2022.At first,the intelligent visual acuity chart projector(LSJ-IVAC-6000A)was used to measure visual acuity three times,and the repeatability of the outcomes was assessed by intraclass correlation coefficient(ICC).And then,standard logarithmic visual acuity chart displayed by the light house was used to measure visual acuity once,and the consistency with intelligent visual acuity chart projector of the outcomes was assessed by ICC and Bland-Altman analysis.Results:The ICCs between the right eye and left eye of each patient by using the intelligent visual acuity chart projector were 0.830 and 0.868,respectively,both ICCs were over 0.8(all P<0.001).The ICCs between the right eye and left eye of each patient by using intelligent visual acuity chart projector and standard logarithmic visual acuity chart were 0.846 and 0.873,respectively,both ICCs were over 0.8(all P<0.001).And the Bland-Altman 95% limits of agreement of the difference between the two measurements were-0.25 to 0.20 and-0.24 to 0.17,respectively.Conclusion:Intelligent visual acuity chart projector can improve the efficiency of visual acuity screening with acceptable repeatability and specific consistency with traditional visual acuity.