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KMID : 1011420150200040477
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Journal of Korean Ophthalmic Optics Society
2015 Volume.20 No. 4 p.477 ~ p.484
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Clinical Evaluation on Variation of Face Form Angle of Eyewear
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Ko Da-Young
Kim Ki-Hong
Lee Dong-Hee
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Abstract
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Purpose: This study was investigated to evaluate the effect of the variation of the face form angle(FFA) of spectacle frame on the visual acuity and the visual function.
Methods: The visual acuity, the contrast sensitivity, the stereopsis, and the phoria were measured with the spectacle frame whose the FFA is at 5o and 25o and the surveys were conducted on subjective symptoms. Here, 30 adults (14 men and 16 women, average age:25.46±3.9), who did not have ocular diseases and were fully corrected in case of having had refractive error, were to act as experimental subjects for this measurement.
Results: The visual acuity and the contrast sensitivity was decreased and the phoria was tended to increase to the esophoria direction at the FFA 25o than at the FFA 5o. The stereopsis was significantly reduced at the FFA 25o than at the FFA 5o. Also when the FFA was larger, the higher the degree of refractive error was, the more the increase of the subjective symptoms such as being blurred characters, being disturbed head, and having sore eyes was, which reveals a statistically significant correlation between them.
Conclusions: If the FFA increases, the visual acuity, the contrast sensitivity and the stereopsis was found to decrease and the phoria to increase to the esophoria direction. Therefore it shows that the variation of the FFA of spectacle frame can influence the visual acuity and the visual function.
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KEYWORD
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Face Form Angle, FFA, Visual Acuity, Contrast Sensitivity, Phoria, Stereopsis
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