Evaluate the collective function of references cited together in a given text segment.
Classify their combined role into one of the following categories: 'method', 'background', or 'result'.

Text:IOVS 2010;51:ARVO E-Abstract 1717).(10) In both previous studies, negative correlations between the refractive lens power and the refractive error of the eye were found, with hyperopic eyes having lower refractive lens power than emmetropic or myopic eyes.
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