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KMID : 1159320100120010009
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Korean Journal of Vision Science
2010 Volume.12 No. 1 p.9 ~ p.18
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The Analysis of Clinical Performance of Corneal Analyzer Compare to Auto Ref-Keratometer
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Pyo Jae-Yeon
Kim Heung-Soo
Mah Ki-Choong
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Abstract
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Purpose: To analyze clinical performance of Auto ref-Keratometer(ARK-510A : NIDEK Co.) and Corneal Analyzer (OPD-SCANⅡ : NIDEK Co.).
Method: 33 subjects(mean age of 27.42±3.3) who have no ocular disease were recruited. Automatic refraction(ARK-510A : NIDEK Co.), OPD-SCAN Ⅱ : NIDEK Co.) and subjective refraction were measured twice with one day interval at the least. The values were converted to J vector(M, J0, J45) in order to evaluate reliability and accuracy.
Result: Mean difference and 95% limit of agreement of test-retest by ARK-510A were M = -0.027±0.405D(-0.821~0.767D), J0 = 0.020±0.138D(-0.250~0.290D), J45 = -0.002±0.097D(-0.192~0.188D) and M = 0.094±0.495D(-0.876~1.064D), J0 = 0.026±0.138D(-0.244~0.300D), J45 = 0.002±0.093D(-0.180~0.184D) by OPD-SCANⅡ respectively. Reliability coefficient of ARK-510A was M = 0.992, J0 = 0.976, J45 = 0.932, and that of OPD-SCANⅡ was M = 0.989, J0 = 0.967, J45 = 0.903. Mean difference and 95% limit of agreement between measurements of subjective refraction and ARK-510A was M = 0.258±0.600D(-0.918~1.434D), J0 = -0.088±0.116D(-0.315~0.139D), J45 = -0.009±0.120 (-0.244~0.226D) and those between subjective refraction and OPD-SCANⅡ was M = 0.381±0.624D(-0.842~1.604D), J0 = 0.022±0.098D-0.170~0.214D), J45 = 0.001±0.108D(-0.210~0.212D). Accuracy of two instrument was different at M(p = 0.006) and J0(p = 0.000) significantly.
Conclusion: Automatic refractometer (ARK-510A) was showed better accuracy and repeatability than those of corneal analyzer(OPD-SCANⅡ). It is considered that corneal analyser can be used clinically to measure refractive error.
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KEYWORD
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Auto refractor, Corneal Analyzer, vector Analyzer, Reliability, Accuracy
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