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KMID : 1159320210230020147
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Korean Journal of Vision Science
2021 Volume.23 No. 2 p.147 ~ p.158
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Comparison of Different Types of Objective Auto Refractors with Subjective Refraction
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Jung Yee-Rin
Park Inn-Jee
Chu Byoung-Sun
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Abstract
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Purpose : The purpose of this study was to compare results from three different types of autorefractor including open-view, closed-view and hand-held type with subjective refraction.
Methods : One hundred students (the mean age of 25.2±1.63) underwent objective refraction using three types of autorefractor including open-fied, closed type and hand-held type (Nvision-k 5001P, KR-8100P and Righton Retinomax K-plus). Subjective refraction for all was performed by an experienced optometrist without reference of autorefractors’ results. The difference of results between three autorefractors and subjective refraction was compared.
Results : With the result of subjective refraction, the difference was shown minimum with open-view autorefractor followed by closed-view and hand-held autorefractor, which is significant difference among the devices (p<0.001). In addition, there was significant difference between subjective and objective refractions in spherical equivalent. The difference was minimum with open-view autorefractor followed by closed-view and hand-held autorefractor(p<0.001).
Conclusion : The difference between open-view and closed-view type of autorefractor was not significant. Therefore, the results from these devices would be a good reference for subjective refraction. However, attention needs to be taken for held-held type as it may stimulate accommodation or cause measurement error.
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KEYWORD
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Closed-view autorefractor, Open-view autorefractor, Portable autorefractor, Subjective refraction
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