Article
How accurate does the autorefractor Shure Sight work?
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Published: | September 22, 2004 |
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Outline
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Objective
The aim of this prospective study is to investigate how accurate works the autorefractometer Shure Sight (Welch Allyn) compared with Retinomax K-plus (Nikon) and standard retinoscopy.
Methods
100 eyes were examined. Patients were initially (pupil not pharmacologically influenced) analyzed with ShureSight (Shneutral) and Retinomax (Retneutral). After standardized Cyclopentolat cycloplegia an examination followed again with both devices (Shcyclo; Retcyclo) and a retinoscopy was done (one observer).
Results
Difference from retinoscopy in spherical values: Shneutral: mean 1±0,8dpt, max. 3dpt; Retneutral: mean 0,54±0,49dpt, max. 2,75dpt; Shcyclo: mean 0,7±0,7dpt, max. 3,5dpt; Retcyclo: mean 0,31±0,31dpt, max. 1,25dpt. Difference in cylindric values: Shneutral: mean 0,33±0,24dpt, max. 1dpt; Retneutral: mean 0,23±0,21dpt, max. 0,75dpt; Shcyclo: mean 0,38 ±0,32 dpt, max. 1,5 dpt; Retcyclo: mean 0,25±0,22dpt, max. 1dpt. Difference in spheric equivalent: Shneutral: mean 1,01±0,82dpt, max. 3,12dpt; Retneutral: mean 0,54±0,47dpt, max. 2,38dpt; Shcyclo: mean 0,71±0,75dpt, max. 3,63dpt; Retcyclo: mean 0,4±0,31dpt, max. 1,38dpt.
Conclusions
Retinomax accuracy is as good as good as shown in former studies, in our experience higher in cycloplegia than with neutral pupil. Shure Sight had some deficits in detecting the right spherical values. It might be usefull for screening small children because of the 35cm observing distance. For a precise refraction a retinoscopy under cycloplegic conditions is still necessary.