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 multiple measurements. Although the means of the various sets of measurements were significantly different, clinically the differences are probably insignificant.
Highlights
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
Conventional refraction and retinoscopy have found that autorefractors give an accurate indication of the refractive state of the eye[12,13,14,15]
Two hundred measurements of refractive state were obtained from a test eye using a Nidek ARK-10000 OPD-scan
Summary
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 repeatability 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 OPDscan. Results: The results of this study suggest that the OPD-scan gives reliable and accurate measures of refractive state when taking multiple measurements. The Nidek ARK-10000 OPD-scan is an instrument that is designed to provide information relating to autorefraction, autokeratometry, corneal topography, wavefront analysis and pupillometry[1, 2]. Autorefractors are considered to provide reasonably accurate and repeatable measurements of refractive state. Conventional refraction and retinoscopy have found that autorefractors give an accurate indication of the refractive state of the eye[12,13,14,15]
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