Ciuffreda Kenneth J, Rosenfield Mark
*OD, PhD, FAAO †MCOptom, PhD, FAAO SUNY College of Optometry, New York, New York (both authors).
Optom Vis Sci. 2015 Dec;92(12):1133-9. doi: 10.1097/OPX.0000000000000726.
The SVOne is a portable Hartmann-Shack wavefront aberrometer that can be attached to a smartphone to determine the refractive error of the eye objectively. The aim of the present study was to compare the findings of the SVOne with retinoscopy, subjective refraction, and two commercially available autorefractors (Topcon KR-1W and Righton Retinomax-3).
Refractive error was assessed both with and without cycloplegia in 50 visually normal, young adults using the five techniques described above. Further, to assess repeatability of the instruments, the entire procedure was repeated in a subgroup of 10 subjects. All data were analyzed in terms of power vectors (M, J0, and J45).
No significant difference was observed between the mean values of M (spherical equivalent) for the different techniques. However, a significantly higher mean value of precyclopegic J0 was recorded for the SVOne, which also had the highest limits of agreement for both the J0 and J45 astigmatic components. Retinoscopy and subjective refraction showed the best repeatability (in terms of M values) for precycloplegic and postcycloplegic measurements, respectively. High and significant linear correlations were observed between the subjective findings and the other four techniques.
The results indicate that the SVOne handheld aberrometer provides measurements of refractive error in normal, young individuals that are not significantly different from other subjective and objective procedures. This instrument is valuable for vision screenings, as well as examinations taking place outside the clinical office. It may also serve as an adjunct in the standard optometric examination.
SVOne是一款便携式哈特曼-夏克波前像差仪，可连接到智能手机上以客观测定眼睛的屈光不正。本研究的目的是比较SVOne与检影验光、主观验光以及两款市售自动验光仪（拓普康KR-1W和赖特隆Retinomax-3）的检测结果。
使用上述五种技术，对50名视力正常的年轻成年人在散瞳和未散瞳状态下的屈光不正进行评估。此外，为评估仪器的重复性，在10名受试者的亚组中重复了整个过程。所有数据均根据屈光力矢量（M、J0和J45）进行分析。
不同技术的M（球镜等效度）平均值之间未观察到显著差异。然而，SVOne记录的散瞳前J0平均值显著更高，其J0和J45散光分量的一致性界限也最高。检影验光和主观验光分别在散瞳前和散瞳后测量中显示出最佳的重复性（就M值而言）。主观验光结果与其他四种技术之间观察到高度且显著的线性相关性。
结果表明，SVOne手持式像差仪在正常年轻个体中提供的屈光不正测量结果与其他主观和客观程序无显著差异。该仪器对视力筛查以及临床办公室以外的检查很有价值。它也可作为标准验光检查的辅助手段。
