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首页> 外文期刊>Ophthalmic & physiological optics: the journal of the British College of Ophthalmic Opticians (Optometrists) >How representative is the 'Representative Value' of refraction provided by the Shin-Nippon NVision-K 5001 autorefractor?
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How representative is the 'Representative Value' of refraction provided by the Shin-Nippon NVision-K 5001 autorefractor?

机译：Shin-Nippon NVision-K 5001自动折射仪提供的折射“代表值”如何代表？

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Purpose: The aim of the study was to evaluate the level of agreement between the 'Representative Value' (RV) of refraction obtained from the Shin-Nippon NVision-K 5001 instrument with values calculated from individual measurement readings using standard algebraic methods. Methods: Cycloplegic autorefraction readings for 101 myopic children aged 8-13 years (10.9 ± 1.42 years) were obtained using the Shin-Nippon NVision-K 5001. Ten autorefractor measurements were taken for each eye. The spherical equivalent (SE), sphere (Sph) and cylindrical component (Cyl) power of each eye were calculated, firstly, by averaging the 10 repeated measurements (Mean SE, Mean Sph and Mean Cyl), and secondly, by the vector representation method (Vector SE, Vector Sph and Vector Cyl). These calculated values were then compared with those of RV (RV SE, RV Sph and RV Cyl) provided by the proprietary software of the NVision-K 5001 using one-way analysis of variance (anova). The agreement between the methods was also assessed. Results: The SE of the subjects ranged from -5.37 to -0.62 D (mean ± SD, = -2.89 ± 1.01 D). The Mean SE was in exact agreement with the Vector SE. There were no significant differences between the RV readings and those calculated using non-vectorial or vectorial methods for any of the refractive powers (SE, p = 0.99; Sph, p = 0.93; Cyl, p = 0.24). The (mean ± SD) differences were: RV SE vs Mean SE (and also RV SE vs Vector SE) -0.01 ± 0.06 D; RV Sph vs Mean Sph, -0.01 ± 0.05 D; RV Sph vs Vector Sph, -0.04 ± 0.06 D; RV Cyl vs Mean Cyl, 0.01 ± 0.07 D; RV Cyl vs Vector Cyl, 0.06 ± 0.09 D. Ninety-eight percent of RV reading differed from their non-vectorial or vectorial counterparts by less than 0.25 D. Conclusion: The RV values showed good agreement to the results calculated using conventional methods. Although the formula used to calculate RV by the NVision-K 5001 autorefractor is proprietary, our results provide validation for the use of RV measurements in clinical practice and vision science research.
机译：目的：研究的目的是评估从Shin-Nippon NVision-K 5001仪器获得的“代表值”（RV）折射值与使用标准代数方法从各个测量读数计算出的值之间的一致性水平。方法：使用Shin-Nippon NVision-K 5001获得101例8-13岁（10.9±1.42岁）近视儿童的验光度数。每只眼睛进行十次验光度数测量。首先，通过平均10次重复测量的平均值（均值SE，均值Sph和均值Cyl），计算每只眼睛的球面等效（SE），球面（Sph）和圆柱分量（Cyl）屈光力，其次，通过矢量表示方法（向量SE，向量Sph和向量Cyl）。然后，使用单向方差分析（方差分析），将这些计算值与NVision-K 5001专有软件提供的RV（RV SE，RV Sph和RV Cyl）进行比较。还评估了方法之间的一致性。结果：受试者的SE范围为-5.37至-0.62 D（平均值±SD，= -2.89±1.01 D）。 Mean SE与Vector SE完全一致。对于任何屈光力，RV读数与使用非矢量或矢量方法计算的RV读数之间无显着差异（SE，p = 0.99; Sph，p = 0.93; Cyl，p = 0.24）。 （平均值±SD）差异为：RV SE vs平均SE（以及RV SE vs矢量SE）-0.01±0.06 D; RV Sph vs平均Sph，-0.01±0.05 D; RV Sph vs矢量Sph，-0.04±0.06 D; RV Cyl vs平均Cyl，0.01±0.07 D; RV Cyl vs矢量Cyl，0.06±0.09D。98％的RV读数与非矢量或矢量对应的差异小于0.25D。结论：RV值与使用常规方法计算的结果显示出良好的一致性。尽管NVision-K 5001自动验光仪用于计算RV的公式是专有的，但我们的结果为在临床实践和视觉科学研究中使用RV测量提供了验证。

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