Browse > Article
http://dx.doi.org/10.14479/jkoos.2015.20.4.477

Clinical Evaluation on Variation of Face Form Angle of Eyewear  

Ko, Da-young (Dept. of Optometry & Vision Science, Catholic University of Daegu)
Kim, Ki-hong (Dept. of Optometry & Vision Science, Catholic University of Daegu)
Lee, Dong-Hee (Dept. of Visual Optics, Far East University)
Publication Information
Journal of Korean Ophthalmic Optics Society / v.20, no.4, 2015 , pp. 477-484 More about this Journal
Abstract
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 $5^{\circ}$ and $25^{\circ}$ and the surveys were conducted on subjective symptoms. Here, 30 adults (14 men and 16 women, average age:$25.46{\pm}3.9$), 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 $25^{\circ}$ than at the FFA $5^{\circ}$. The stereopsis was significantly reduced at the FFA $25^{\circ}$ than at the FFA $5^{\circ}$. 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.
Keywords
Face Form Angle; FFA; Visual Acuity; Contrast Sensitivity; Phoria; Stereopsis;
Citations & Related Records
Times Cited By KSCI : 2  (Citation Analysis)
연도 인용수 순위
1 Ko KJ. The Study on Advanced Service Development Plan of Leisure Sport Industry through Service Differentiation Strategies. PhD Thesis. Korea University, Seoul. 2011:1.
2 Seo JK, Cho YN, Shim HS, Kim SH. A study on the spherical aberration and astigmatism of sports sunglass. Korean J Vis Sci. 2013;15(2):101-111.
3 Lee WJ, Sung DY, Youk DJ, Kang SS, Jang YS, Park SC et al. A study of sunglasses being sold in domestic. J Korean Ophthalmic Opt Soc. 2004;9(1):125-134.
4 Lee JM, Jo HR, Jang WY. Study and research of seller's optical knowledge about sale of goggle or sun-glass. J Korean Ophthalmic Opt Soc. 2009;4(4):1-10.
5 Sung PJ. Optometric dispensing, 3rd Ed. Seoul: Daihakseorim, 2010;17.
6 von Noorden GK. Binocular Vision and Ocular Motility, 3rd Ed. St Louis: The CV Mosby, 1985;158.
7 Kim HD, Park EK, Kim KH. Clinical evaluation between the opitical center of spectacles and pupillary center. J Korean Ophthalmic Opt Soc. 2003;8(2):19-24.
8 Jaile M. The principles of ophthalmic lenses, 4th Ed. London: Association of British Dispensing Opticians, 1984; 402-403.
9 Heitzmann J, Binder PS, Kassar BS, Nordan LT. The correction of high myopia using the excimer laser. Arch Ophthalmol. 1993;111(12):1627-1634.   DOI
10 Jindra LE, Zemon V. Contrast sensitivity testing: a more complete assessment of vision. J Cataract Refract Surg. 1989;15(2):141-148.   DOI
11 Sekuler R, Owsley C, Hutman L. Assessing spatial vision of older people. Am J Optom Physiol Optics. 1982; 59(12):961-968.   DOI
12 Kim JB. Effect of pinhole glasses on visual functions. Master Thesis. Catholic University of Daegu, Kyungsan. 2015;19.
13 Carson NB, Kurtz D. Clinical procedures for ocular examination, 3rd Ed. Seoul: Daihakseorim, 2008;263-266.
14 Hong DG, Jung HS, Park SA. Analysis of far & near distance of lateral phoria various testing methods. J Korean Ophthalmic Opt Soc. 2004;9(2):423-430.
15 Sung PJ. Optometry, 3rd Ed. Seoul: Daihakseorim, 2003; 589-591.
16 Sung PJ. Optometry, 3rd Ed. Seoul: Daihakseorim, 2003; 237-276.