Department of Dean's Education, Illinois College of Optometry, Chicago, Illinois, USA.
Clin Exp Optom. 2020 Sep;103(5):663-667. doi: 10.1111/cxo.13018. Epub 2019 Dec 10.
The aim of this study was to determine the repeatability of an automated-ETDRS (Early Treatment Diabetic Retinopathy Study) near and intermediate visual acuity measurement in subjects with normal visual acuity and subjects with reduced visual acuity. The agreement of automated-ETDRS with gold standard chart-based visual acuity measurement was also studied.
Fifty-one subjects were tested (aged 23 to 91 years; 33 subjects with normal visual acuity: 6/7.5 or better; 18 subjects with reduced visual acuity: 6/9 to 6/30). Near and intermediate visual acuity of one eye from each subject was measured with an automated tablet-computer system (M&S Technologies, Inc.) and Precision Vision paper chart in a random sequence. Subjects were retested one week later. Repeatability was evaluated using the 95 per cent limits of agreement (LoA) between the two visits.
Average difference between automated-ETDRS near visual acuity and near visual acuity by paper chart was 0.02 ± 0.10 logMAR (p > 0.05). Agreement of near visual acuity between automated-ETDRS and paper chart was good, with 95 per cent LoA of ±0.19 logMAR. Furthermore, automated-ETDRS near visual acuity showed good repeatability (95 per cent LoA of ±0.20). Mean difference between automated-ETDRS intermediate visual acuity and intermediate visual acuity by paper chart was 0.02 ± 0.10 logMAR (p > 0.05). Agreement of intermediate visual acuity between automated-ETDRS and paper chart was good, with 95 per cent LoA of ±0.20 logMAR. In addition, automated-ETDRS intermediate visual acuity had good repeatability (95 per cent LoA of ±0.16).
Automated-ETDRS near and intermediate visual acuity measurement showed good repeatability and agreement with the gold standard chart-based visual acuity measurement. The findings of this study indicate the automated visual acuity measurement system may have potential for use in both patient care and clinical trials.
本研究旨在确定在视力正常和视力下降的受试者中，自动 ETDRS（早期糖尿病视网膜病变研究）近视力和中距离视力测量的可重复性。还研究了自动 ETDRS 与金标准图表视力测量的一致性。
对 51 名受试者（年龄 23 至 91 岁；33 名视力正常受试者：6/7.5 或更好；18 名视力下降受试者：6/9 至 6/30）的一只眼睛进行近视力和中距离视力测试。使用自动平板电脑系统（M&S Technologies，Inc.）和 Precision Vision 纸质图表以随机顺序对每位受试者的近视力和中距离视力进行测试。一周后对受试者进行复测。使用两次就诊的 95%一致性界限（LoA）评估重复性。
自动 ETDRS 近视力与纸质图表近视力的平均差异为 0.02±0.10 logMAR（p>0.05）。自动 ETDRS 近视力与纸质图表的一致性良好，95%LoA 为±0.19 logMAR。此外，自动 ETDRS 近视力具有良好的可重复性（95%LoA 为±0.20）。自动 ETDRS 中距离视力与纸质图表中距离视力的平均差异为 0.02±0.10 logMAR（p>0.05）。自动 ETDRS 中距离视力与纸质图表的一致性良好，95%LoA 为±0.20 logMAR。此外，自动 ETDRS 中距离视力具有良好的可重复性（95%LoA 为±0.16）。
自动 ETDRS 近视力和中距离视力测量具有良好的可重复性和与金标准图表视力测量的一致性。本研究结果表明，自动视力测量系统可能具有在患者护理和临床试验中应用的潜力。
