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KMID : 1011420180230010039
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Journal of Korean Ophthalmic Optics Society
2018 Volume.23 No. 1 p.39 ~ p.45
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A Comparison of Auto-Refraction and Subjective Refraction : Based on Photorefractor (VS100)
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Lee Kyung-Hun
Shim Hyun-Suk
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Abstract
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Purpose: This study was conducted for comparition the refractive error measured by auto-refraction and subjective refraction.
Methods: 100 adults (200 eyes, mean age 22.04±3.14 years) included in this study. Refractive error was measured using by a Photorefractor (VS100), an open-view autorefractor (Nvision k-5001), and a closed autorefractor (ARK-1a). The measured values were converted into power vector components (M, J0, J45) and compared with subjective refraction.
Results: The mean difference between subjective refraction and VS100 was M = -0.08±0.67 D, J0= -0.02±0.28 D, J45 = 0.01±0.23 D, and there was no significant difference in all components (p>0.05). The accuracy coefficients were M= 1.313, J0= 0.564, J45= 0.454. The mean difference between the subjective refraction and ARK-1a was M = 0.49±0.84 D, J0 = -0.05±0.19 D, J45 = 0.01±0.14 D, and there was a significant difference between the M and J0 components (p<0.05). However J45 components were not significantly different (p>0.05). The accuracy coefficients were M = 1.664, J0 = 0.372, J45 = 0.292. The mean difference between the subjective refraction and the Nvision K-5001 was M = 0.16±0.63 D, J0 = -0.09±0.30 D, J45 = 0.01±0.18 D, with a significant difference between M and J0 components (p<0.05), but there was no significant difference in J45 (p>0.05). The accuracy coefficients were M = 1.250, J0 = 0.603, J45 = 0.364.
Conclusions: As a result of comparing the refractive error of the autorefractor, the refractive power of the photorefractor was measured in the positive direction, but this is considered to be less influenced by the accommodation, and the difference is considered to be small in term of clinical view. The sensitivity of VS100 was 87.7% and the specificity was 75.9%, which was useful for measuring refractive error and correlated with subjective refraction. Photorefractor can be used as a preliminary examinations for subjective refraction because they can open the binocular and measure the refraction error without a large mistake in a short time.
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KEYWORD
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Refractive error, Auto-refraction, Subjective refraction, Photorefractor, VS100
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