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KMID : 1011420140190020231
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Journal of Korean Ophthalmic Optics Society
2014 Volume.19 No. 2 p.231 ~ p.237
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Research of Difference between the Refractive Powers by Autorefractometer and the Prescription using Phoropter
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Lee Ju-Whan
Lee Koo-Seok
Hong Hyung-Ki
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Abstract
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Purpose: This study is research of the conditions which causes difference between the refractive power of the easurement of autorefractometer and the prescription using phoropter.
Methods: Autorefractometer (SR-7000) and phoroptor (AV-9000) were used to measure 60 eyes of 30 participants who had no eye diseases and wore the corrective lens due to Ametropia. To prevent the dependence of the prescription value of the refractive power on the testers, two testers measured the refractive power of the eyes of the participants at the same measuring conditions.
Results: Statistically, the prescribed values of the refractive power by two testers were not significantly different. Most of the prescribed values of the refractive power were smaller than the refractive power by autorefractometer In case of myopic eyes, the difference between refractive powers by the measurement of autorefractometer and the prescription using phoropter showed the trend of increase as the spherical refractive power became larger. The result was analyzed by the range of the different cylindrical refractive power for the myopic astigmatic eyes. In this case, the difference between refractive powers showed the trend of decrease as the cylindrical refractive power became larger.
Conclusions: No difference between the prescribed value by two testers was observed. In case of myopic or myopic astigmatic eyes, the difference between refractive powers by autorefractometer and the prescription were measured to be approximately proportional to the refractive powers of ametropic eyes. As the this difference become larger for the participant who needs the lens of larger refractive power, additional caution is needed in the prescription of the refractive power of the corrective lens.
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KEYWORD
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Autorefractometer, Phoropter, Prescription of the refractive power, Subjective refraction, Objective refraction
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