Accuracy of the Hand-held Wavefront Aberrometer in Measurement of Refractive Error

Abstract

Uncorrected refractive errors are a major cause of amblyopia, which interrupts social functioning and academic performance in children [1]. It is estimated that over one billion people suffer from uncorrected refractive errors worldwide [2,3]. The incidence rate of amblyopia caused Purpose: To compare refractive error measured by hand-held wavefront aberrometers with postcycloplegic autorefraction (AR) and cycloplegic refraction (CR). Methods: The medical records of patients who received refractive measurements using the wavefront aberrometer, postcycloplegic AR, and CR between January 2014 and January 2016 were retrospectively analyzed. The mean differences, 95% confidence intervals, and limits of agreement (LOA) were calculated for the refractive vector components (M, J 0 , and J 45). Results: Fifty-one patients (9.0 ± 5.5 years, male 41.2%) were enrolled in this study, and only the right eye of each was included. Refractive errors ranged from-9.25 to +7.25 diopters (D) for spherical equivalent (median, 0.75 D). The M component was not significantly different among the three methods (p = 0.080). However, the J 0 vector component was significantly different (p < 0.001). After post hoc analysis, the wavefront aberrometer obtained more positive values for J 0 compared to the other methods. The J 45 component was not significantly different among the three methods (p = 0.143). The mean difference between the wavefront aberrometer and postcycloplegic AR was-0.115 D (LOA,-1.578 to 1.348 D) for M, 0.239 D (LOA,-0.371 to 0.850 D) for J 0 , and-0.015 D (LOA,-0.768 to 0.738 D) for J 45. The mean difference between the wavefront aberrometer and CR was-0.220 D (LOA,-1.790 to 1.350 D) for M, 0.300 D (LOA,-0.526 to 1.127 D) for J 0 , and-0.079 D (-0.662 to 0.504 D) for J 45. Conclusions: The wavefront aberrometer showed good agreement with postcycloplegic AR and CR in spherical equivalents, but tended to produce slightly myopic results. The wavefront aberrometer also overestimated with-the-rule astigmatism. Therefore, we recommend that the device be used for estimations of refractive error, which may be useful for patients who have postural difficulties, live in undeveloped countries, or are bedridden.

Simulation of the Human Myopic Eye Cornea Compensation Based on the Analysis of Aberrometric Data

“…For example, using a tracer aberrometer (iTrace) and a Hartmann-Shack aberrometer (Topcon KR-1 W) provide excellent repeatability but less reliable reproducibility when measuring high-order aberrations [ 48 ]. Portable wavefront aberrometer ( hand-held wavefront aberrometers ) with postcycloplegic autorefraction ( postcycloplegic autorefraction-AR ) and cycloplegic refraction ( cycloplegic refraction–CR ) showed good agreement between measurements with postcycloplegic AR and CR in spherical equivalents but tended to give results with falsely detected myopia [ 49 ].…”