Comparison of Accuracy of the KR-8100P, Nvision K-5001, and KR-1W

Abstract

Purpose: To compare the accuracy between subjective refraction and autorefraction using KR-8100P, Nvision K-5001 and KR-1W. Methods: Forty-two subjects (84 eyes) aged 20 to 29 (mean, 23.90±2.39 years) participated in this study. Prospective data were obtained using closed-view autorefractor (KR-8100P), open-field autorefractor (Nvision K-5001) wave front aberrometer (KR-1W) and subjective refraction. The measured refractive errors were converted into power vector (M, J0, J45 components) for data analysis. The accuracy for each instrument was evaluated based on the subjective refraction. Results: There were significant differences between measurements obtained with the subjective refraction and KR-8100P for M, J0 and J45 were -0.34±0.42 D, 0.06±0.22 D, and -0.08±0.15 D (p<0.05). The differences between measurements obtained with the subjective refraction and Nvision K-5001 for M, J0, J45 were 0.20±0.47 D, -0.03±0.22 D, and -0.01±0.16 D, that we found significant difference only in M component (p<0.05). The differences between the measurement of subjective refraction and KR-1W for M, J0, J45 were -0.14±0.39 D, -0.02±0.18 D, and -0.02±0.14 D, that we found significant difference only in M component(p<0.05). Coefficient of accuracy for M, J0, and J45 components of KR-8100P, Nvision K-5001 and KR-1W were 0.823, 0.431, 0.294 and 0.921, 0.431, 0.313 and 0.764, 0.352, 0.274 respectively. Conclusions: The accuracy of autorefractometers based on subjective refraction, KR-1W is more accurate than KR-8100P and Nvision K-5001. Despite a statistically significant difference in mean spherical equivalent measured with three instruments, the differences are clinically near identical, that we suggest three autorefractors are suitable for preliminary examination for subjective refraction.