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http://dx.doi.org/10.14479/jkoos.2015.20.2.211

Comparisons of Phoria Test Among Prism Settings of Von Graefe Technique  

Yu, Dong-Sik (Dept. of Optometry and Vision Science, Kyungwoon University)
Ha, Eun-Mi (Dept. of Optometry and Vision Science, Kyungwoon University)
Publication Information
Journal of Korean Ophthalmic Optics Society / v.20, no.2, 2015 , pp. 211-218 More about this Journal
Abstract
Purpose: The aim of this study was to compare the differences among prism settings of the von Graefe technique for phoria measurement. Methods: Thirty eight healthy subjects (mean age $22.35{\pm}2.72years$) were tested with eye examination by interview, cover test, and refraction. Phorias were measured in a random order using four prism settings for the von Graefe method: base-in (BI) and base-up (BU), BI and base-down (BD), BU and BI, and BD and BI over the right and left eye, respectively. Results: Among the four prism settings in measurements of lateral and vertical phoria, there were not significant differences at distance, whereas there were significant at near. The reliability of near lateral phoria (ICC: 0.95) was good, but that of near vertical phoria was less reliable (ICC: 0.83). In comparisons of the paired t-test, the 95% limits of agreement, and mean difference between prism settings, BU had more useful than other prism settings at near phoria. Conclusions: Results from this study suggest that the von Graefe test with BU or BU including other setting prisms have useful methods, especially for near phoria measurements.
Keywords
Phoria; Von graefe; Prism setting; Reliability;
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