Table 1.
Refractive characteristics of 197 study eyes.
Fig 1.
Bland-Altman plots with 95% limits of agreement for (A) subjective refraction and 3Nethra autorefractor and (B) subjective refraction and Nidek autorefractor.
Table 2.
Mean difference and 95% limits of agreement (LOA) between measurements from subjective refraction and autorefraction.
Fig 2.
Area under the receiver operating characteristics (ROC) curve, sensitivity, and specificity plotted for each half-diopter of myopia, hyperopia, and astigmatism as assessed from the subjective refraction reference standard.
Sensitivities and specificities were assessed from the optimal test threshold for each ROC curve, as assessed by the Youden index. The dots represent the estimate and the lines the 95% confidence interval (green = Nidek, red = 3nethra).
Table 3.
Sensitivity and specificity of two autorefractors relative to subjective refraction.
The optimal test threshold for each index test relative to each reference standard was assessed from the Youden index of the respective receiver operating characteristics (ROC) curve. Diagnostic accuracy was assessed in 197 eyes from 104 people aged 50 years or older.