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J. Barreto Junior, M. Vieira Netto, A. C. Cigna, R. M. Santo, S. J. Bechara; Repeatability of Higher-Order Strehl Ratio With Skiascopic Wavefront Sensor. Invest. Ophthalmol. Vis. Sci. 2007;48(13):2774.
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To validate the repeatability of total (TS) and higher-order Strehl ratio (HS) with a retinoscopic wavefront sensor.
A prospective observational case series. A sample of 12 eyes of 6 patients with a mean spherical equivalent of -5.5 ± 3.4 diopters (D) were submitted to retinoscopic aberrometry with the Optical Path Difference (OPD)-Scan ARK-10000. Measurements were performed by two different examiners with and without pupil dilation under standardized light conditions. Four consecutive wavefront measurements at both 5.8 ± 0.8 and 8.2 ± 0.6mm pupil were performed (p=0.002, Wilcoxon test).
The discriminant analysis of all repeated measurements for both pupil diameters were not significant. Both the Friedman test, specific for each variable (TS and HS), and the ANOVA with repeated measures were also not significant (p>0.2). The inter and intra-observer repeatability was validated by the Wilcoxon matched pairs test. All possible combinations of measurements, performed by both examiners, were tested and no statistically significant difference was found for both pupil diameters (p>0.1).
The Strehl ratio is a popular metric of optical quality that has shown good inter and intra-observer repeatability with the OPD-Scan for different pupil diameters.
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