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Non-cycloplegic spherical equivalent refraction in adults:comparison of the double-pass system, retinoscopy, subjective refraction and a table-mounted autorefractor

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Author(s): Meritxell Vilaseca | Montserrat Arjona | Jaume Pujol | Elvira Peris | Vanessa Martínez

Journal: International Journal of Ophthalmology
ISSN 2222-3959

Volume: 6;
Issue: 5;
Start page: 618;
Date: 2013;
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Keywords: double-pass system | optical quality | retinoscopy | autorefraction | subjective refraction | accuracy | repeatability | trueness

ABSTRACT
AIM:To evaluate the accuracy of spherical equivalent (SE) estimates of a double-pass system and to compare it with retinoscopy, subjective refraction and a table-mounted autorefractor.METHODS: Non-cycloplegic refraction was performed on 125 eyes of 65 healthy adults (age 23.5±3.0 years) from October 2010 to January 2011 using retinoscopy, subjective refraction, autorefraction (Auto kerato-refractometerTOPCON KR-8100, Japan) and a double-pass system (Optical Quality Analysis System, OQAS, Visiometrics S.L., Spain). Nine consecutive measurements with the double-pass system were performed on a subgroup of 22 eyes to assess repeatability. To evaluate the trueness of the OQAS instrument, the SE laboratory bias between the double-pass system and the other techniques was calculated.RESULTS:The SE mean coefficient of repeatability obtained was 0.22D. Significant correlations could be established between the OQAS and the SE obtained with retinoscopy (r=0.956, P
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