Purpose

To determine the margin reflex distance (MRD) in healthy subjects using autorefractometer front monitor images (ARFMI) and validate the accuracy of this method by comparing it with conventional methods.

Methods

One hundred eyes of 50 healthy subjects aged 20–59 years were included in the study. Autorefractometer front monitor images were video-recorded using a smartphone camera, and screenshots were taken to analyze the MRD. The results were compared with those from conventional methods to determine the reliability of the method. To evaluate the repeatability and reproducibility of all measurement methods, we performed two different visits by two observers.

Results

The mean MRD-1 of the autorefractometer image measurement was 4.29 ± 0.90 mm, mean MRD-1 of the of the digital photography image measurement was 3.78 ± 1.03 mm, and mean MRD-1 of the manual measurement was 4.02 ± 1.09 mm. The mean difference (MD) of MRD-1 was analyzed and it was found that MD of the autorefractometer image was significantly higher than the MD of other groups (p < 0.001). The best repeatability was found in the autorefractometer image measurement [intraclass correlation coefficients (ICC): 0.960], and substantial to excellent repeatability was found in the manual (ICC: 0.903) and digital photography image measurements (ICC: 0.843). The mean inter-eye difference of MRD-1 measured by the three methods was analyzed, and there was a statistically significant difference in the autorefractometer and digital image groups (p: 0.001, p: 0.002, respectively).

Conclusion

Margin reflex distance measurement using ARFMI analysis is a novel, simple, accurate, reliable, and objective method. The autorefractometer device is readily available and can be found in any ophthalmic clinic. Therefore, ophthalmologists can easily measure and record MRD values and use the accurate and reliable results for follow-up and medicolegal issues.

中文翻译：

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一种利用自动验光仪测量边缘反射距离的新方法

目的

使用自动验光仪前监视器图像 (ARFMI) 确定健康受试者的边缘反射距离 (MRD)，并通过将其与传统方法进行比较来验证该方法的准确性。

方法

该研究包括 50 名 20-59 岁的健康受试者的 100 只眼睛。使用智能手机摄像头对自动验光仪前监视器图像进行视频记录，并截取屏幕截图以分析 MRD。将结果与传统方法的结果进行比较，以确定该方法的可靠性。为了评估所有测量方法的可重复性和再现性，我们由两名观察员进行了两次不同的访问。

结果

自动折射仪图像测量的平均 MRD-1 为 4.29 ± 0.90 mm，数码摄影图像测量的平均 MRD-1 为 3.78 ± 1.03 mm，手动测量的平均 MRD-1 为 4.02 ± 1.09 mm。对MRD-1的平均差（MD）进行分析，发现自动验光仪图像的MD显着高于其他组的MD（p < 0.001)。在自动验光仪图像测量中发现了最好的可重复性 [组内相关系数 (ICC): 0.960]，在手册 (ICC: 0.903) 和数码摄影图像测量 (ICC: 0.843) 中发现了相当出色的可重复性。分析3种方法测得的MRD-1平均眼间差异，自动验光仪组和数字图像组差异有统计学意义（分别为p：0.001，p：0.002）。

结论

使用 ARFMI 分析的边缘反射距离测量是一种新颖、简单、准确、可靠和客观的方法。自动验光仪设备很容易获得，并且可以在任何眼科诊所找到。因此，眼科医生可以轻松测量和记录 MRD 值，并将准确可靠的结果用于随访和法医问题。