Comparison of the Correlations and Differences between the Autorefraction Measured by OPD-Scan III and Non-Cycloplegic Subjective Refraction

Objective: To compare the correlations and differences between autorefraction measured by OPD-Scan III in light and dark modes with non-cycloplegic subjective refraction. Methods: This was a series of case studies. One hundred and two patients (204 eyes) with refractive errors were selected from the Ideal Ophthalmology Hospital affiliated to Soochow University during July 2018. All patients underwent autorefraction with OPD-Scan III and subjective refraction with a competent optometrist. Statistical analyses and comparisons were made on spherical (S), cylinder (C), spherical equivalent (SE), J0 (Jackson cross-cylindervalues at 180° and 90°) and J45 (Jackson cross-cylindervalues at 135° and 45°). Data were statistically analyzed using a t test, regression test and Pearson correlation. Results: The values of S, C, SE, J0 and J45 measured under OPD-Scan III light mode were positively correlated with those measured by subjective optometry (r=0.797, 0.877, 0.806, 0.918, 0.623, all P<0.001). All the measurements showed statistically significant differences. The values of S, C and SE measured under OPD-Scan III illumination were -0.33 D, -0.08 D, and -0.37 D were higher than those measured under subjective optometry, and the differences were statistically significant between the two measurements (t=4.232, 3.058, 4.741, all P<0.05). There was no statistically significant difference for J0 but J45 showed a statistically significant difference (t=-2.342, P=0.021). The values of S, C, SE, J0, and J45 measured under OPD-Scan III dark light mode were positively correlated with the values measured by subjective optometry (r=0.877, 0.629, 0.894, 0.753, 0.466, all P<0.001). The values of S, C and SE measured by OPD-Scan III under dark light were higher than those measured by subjective optometry, -0.57 D, -0.41 D, and -0.77 D, respectively, and the differences were statistically significant between the two measurements (t=8.864, 8.777, 3.263, all P<0.001). There was no statistically significant difference for J0 and J45. Conclusions: The correlations and differences between the autorefractions measured by OPD-Scan III in light and dark mode with subjective refraction showed statistical significance. But the difference between autorefraction measured by OPD-Scan III in light mode and subjective optometry is small, which is acceptable in the clinic. Key words: OPD-Scan III; refractive errors; autorefraction; subjective refraction