Abstract
Introduction: It is important for the users of automated instruments that measure refractive state to know that the results obtained from such instruments are accurate and repeatable. This study was conducted to investigate the repeat-ability of multiple measures of refractive state using a Nidek ARK-10000 OPD-scan.Method: 150 measurements of refractive state of a test eye were obtained using an OPD- scan. The method of focusing and triggering the instrument was varied for three sets of 50 measurements.Results: The results of this study suggest that the OPD-scan gives reliable and accurate measures of refractive state when taking mul-tiple measurements. Although the means of the various sets of measurements were significantly different, clinically the differences are probably insignificant.
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