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Evaluation of Reliability for Combined Refractive Power of Lenses in an Automatic Phoropter
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 Title & Authors
Evaluation of Reliability for Combined Refractive Power of Lenses in an Automatic Phoropter
Lee, Hyung Kyun; Kim, So Ra; Park, Mijung;
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 Abstract
Purpose: To evaluate the reliability of refractive power by comparing the marked refractive power in an automatic phoropter and actually measured spherical/cylindrical refractive power. Methods: Actual refractive power of minus spherical lens and cylindrical lens in an automatic phoropter was measured by a manual lensmeter and compared with the accuracy of marked refractive power. Furthermore, combined refractive power and spherical equivalent refractive power of two overlapped lenses were compared and evaluated with the refractive power of trial lens. Results: An error of 0.125 D and more against the marked degree was observed in 70.6% of spherical refractive power of spherical lens which is built in phoropter, and the higher error was shown with increasing refractive power. Single cylindrical refractive power of cylindrical lens is almost equivalent to the marked degree. Combined spherical refractive power was equivalent to spherical refractive power of single lens when spherical lens and cylindrical lens were overlapped in a phoropter. Thus, there was no change in spherical refractive power by lens overlapping. However, there was a great difference, which suggest the effect induced by overlapping between cylindrical refractive power and the marked degree when spherical lens and cylindrical lens were overlapped. Spherical equivalent refractive power measured by using a phoropter was lower than that estimated by trial glasses frame and marked degree. The difference was bigger with higher refractive power. Conclusions: When assessment of visual acuity is made by using an automatic phoropter for high myopes or myopic astigmatism, some difference against the marked degree may be produced and they may be overcorrected which suggests that improvement is required.
 Keywords
Automatic phoropter;Trial lens;Combined refractive power;Spherical equivalent refractive power;Reliability;
 Language
Korean
 Cited by
 References
1.
Ministry of education. A sample survey on healthy lifestyle of students, 2014. http://www.moe.go.kr/web/100026/ko/board/view.do?bbsId=294&pageSize=10& currentPage=0&encodeYn=Y&boardSeq=58456&mode=view(15 September 2015).

2.
Optinews. Study of glasses wearers in Korea, 2015. http://www.opticnews.co.kr/news/articleView.html?idxno=24919 (22 September 2015).

3.
Kang HS. An introduction to visual optics, 2nd Ed. Seoul:Shinkwang, 2004;25-27.

4.
Lee HK, Kim SR, Park M. The evaluation of reliability for the combined refractive power of overlapping trial lenses. J Korean Ophthamol Opt Soc. 2015;20(3):263-276. crossref(new window)

5.
Park SY, Mun BY. Research on the actual state of domestic trial lens. Korean J Vis Sci. 2007;9(4):401-412.

6.
Moon BY. Comparative analysis of refractive power on trial case lenses. J Korean Ophthamol Opt Soc. 2012; 17(4):321-334.

7.
Optical science textbook compilation committee. Optometric instrumentation, 2nd Ed. Seoul: Daehakseorim, 2000; 260-262.

8.
Seo JK, Jo YN, Sim HS, Kim SH. A study on the spherical aberration and astigmatism of sports sunglass. Korean J Vis Sci. 2013;15(2):101-111.

9.
Kim SK, Sung AY. The clinical study on spectacle wearers of high school students. J Korean Ophthamol Opt Soc. 2004;9(1)19-27.

10.
Ryu GC, Seo JS. Assessment of applicability of clinical performance of Eyemax free RGP contact lenses. Korean J Vis Sci. 2010;12(1):1-8.

11.
Levitz L, Reich J, Roberts K, Hodge C. Evaluation of toric intraocular lenses in patients with low degrees of astigmatism. Asia Pac J Ophthalmol. 2015;4(5):245-249. crossref(new window)

12.
Efron N, Nichols JJ, Woods CA, Morgan PB. Trends in US contact lens prescribing 2002 to 2014. Optom Vis Sci. 2015;92(7):758-767. crossref(new window)

13.
Hussein MA, Weakley D, Wirazka T, Paysse EE. The long-term outcomes in children who are not compliant with spectacle treatment for accommodative esotropia. J AAPOS. 2015;19(2):169-171. crossref(new window)

14.
Esteve-Taboada JJ, Domnguez-Vicent A, Del guila-Carrasco AJ, Ferrer-Blasco T, Monts-MicR. Effect of large apertures on the optical quality of three multifocal lenses. J Refract Surg. 2015;31(10):666-676. crossref(new window)