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KMID : 1011420130180030313
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Journal of Korean Ophthalmic Optics Society
2013 Volume.18 No. 3 p.313 ~ p.320
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A Comparative Study on Quantity of Phoria between New Phoria Measurement with 3D Display and Existing Methods
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Kang Seok-Hyon
Hong Hyung-Ki
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Abstract
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Purpose: This study compared the quantity of phoria for distance by new method with that by existing methods.
Methods: For this study, it was selected to two existing phoria measurements, von Graefe and Maddox rod. And new method named “3D polarizing phoria measurement” was designed to measure the quantity of phoria using polarizing glasses and 3D display. Unlike existing measurement using polarized lens, newly considered method measured the quantity of phoria in condition removed perfect binocular fusion using field stop on apparatus and polarized lens. For using new method for distance, it was developed a phoria test chart. It supports three kinds of phoria measurements. Subjects were 12 (male 6, female 6). They had three phoria tests (1 sets) including new method. It was considered the effect of experimental order, so we tested all cases about experimental order. The number of cases was 6 sets, and the sample size in this experiment was 72 sets. For removing binocular fusion, lighting of the laboratory that was below 10 lx and the background color of phoria test chart was dark, RGB=(20, 20, 20).
Results: Subjects were sorted into three groups. Samples with exophoria and orthophoria were 30 sets each, and those with esophoria were 12 sets. The quantity of phoria measured three tests differ from each other like “newmethod < von Graefe < Maddox rod”, and there were statistically significant difference each other.
Conclusions: This study has great significance in the sense that new method was the measurement with naturally
removing binocular fusion without dizziness during the tests.
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KEYWORD
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3D display, Phoria for distance, Exophoria, Esophoria, Orthophoria, Polarizing glasses, von Graefe, Maddox rod
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