Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/36952
Title: How representative is the representative value from Shin-Nippon NVision-K 5001 autorefractor?
Authors: Tang, YY
Tang, WC
To, CH 
Lam, SCY 
Issue Date: 2010
Source: IMC 2010 13th International Myopia Conference 2010, July 26-29, 2010, Tubingen, Germany How to cite?
Abstract: Purpose: To evaluate the closeness of the representative values obtained from the ShinNippon NVision-K 5001 with the refractions calculated by other conventional methods.
Methods: The refractive error of 202 myopic eyes of 101 children aged 8 to 13 years (mean age = 10.9 years) was measured with cycloplegia using the Shin-Nippon NVisionK 5001 autorefractor. Ten autorefractor measurements were taken for both eyes of each subject. The spherical equivalent (SE), spherical component (Sph) and cylindrical component (Cyl) of each eye were calculated by mean of ten measurements and by the vector representation method. The SE, Sph and Cyl by these two methods were then compared with those of representative values (RV) from the in-build system of Shin-Nippon NVision-K 5001 autorefractor using oneway ANOVA analysis with Bonferroni adjustment for multiple comparisons.
Results: The refractive error of the subjects in SE was from -5.37 to -0.62D with the mean of -2.87D + 0.98. The SE of RV from Shin-Nippon NVision-K 5001 showed no statistically significant differences from those calculated by mean of ten measurements and the vector representation method (differences, -0.01D + 0.06, p= 0.99). The Sph calculated by mean of ten measurements (difference, -0.01 + 0.05) and by vector representation method (difference, -0.04 + 0.06) were similar to that of RV (p=0.92). There were also no significant differences in Cyl among three presentation methods (difference between RV and mean of ten measurements = 0.00 + 0.07; difference between RV and vector representation method = 0.05 + 0.09, p=0.22).
Discussion and Conlusions: Although the exact calculation mechanism of the RV from the in-build system of Shin-Nippon NVision-K 5001 autorefractor was not disclosed to users, we found it is no different from the refractions calculated by other conventional methods. Therefore, the RV can be used in clinical practice and for data analysis in optometric research.
URI: http://hdl.handle.net/10397/36952
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