Ogbuehi Kelechi C, Almaliki Wael H, AlQarni Ahmed, Osuagwu Uchechukwu L
*PhD, FAAO †BSc ‡MSc, OD Department of Medicine, Dunedin School of Medicine, University of Otago, Dunedin, New Zealand (KCO); Department of Optometry and Vision Sciences, College of Applied Medical Sciences, King Saud University, Riyadh, Saudi Arabia (WHA, AA); and Institute of Health and Biomedical Innovation, Department of Optometry and Vision Sciences, Brisbane, Queensland, Australia (ULO).
Optom Vis Sci. 2015 May;92(5):632-41. doi: 10.1097/OPX.0000000000000566.
To assess the performance of the 2Win eccentric videorefractor in relation to subjective refraction and table-mounted autorefraction.
Eighty-six eyes of 86 adults (46 male and 40 female subjects) aged between 20 and 25 years were examined. Subjective refraction and autorefraction using the table-mounted Topcon KR8800 and the handheld 2Win videorefractor were carried out in a randomized fashion by three different masked examiners. Measurements were repeated about 1 week after to assess instrument reproducibility, and the intertest variability was compared between techniques. Agreement of the 2Win videorefractor with subjective refraction and autorefraction was assessed for sphere and for cylindrical vectors at 0 degrees (J0) and 45 degrees (J45).
Reproducibility coefficients for sphere values measured by subjective refraction, Topcon KR8800, and 2Win (±0.42, ±0.70, and ±1.18, respectively) were better than their corresponding J0 (±1.0, ±0.85, and ±1.66) and J45 (±1.01, ±0.87, and ±1.31) vector components. The Topcon KR8800 showed the most reproducible values for mean spherical equivalent refraction and the J0 and J45 vector components, whereas reproducibility of spherical component was best for subjective refraction. The 2Win videorefractor measurements were the least reproducible for all measures. All refractive components measured by the 2Win videorefractor did not differ significantly from those of subjective refraction, in both sessions (p > 0.05). The Topcon KR8800 autorefractometer and the 2Win videorefractor measured significantly more positive spheres and mean spherical equivalent refraction (p < 0.0001), but the J0 and J45 vector components were similar (p > 0.05), in both sessions.
The 2Win videorefractor compares well, on average, with subjective refraction. The reproducibility values for the 2Win videorefractor were considerably worse than either subjective refraction or autorefraction. The wide limits of reproducibility of the 2Win videorefractor probably limit its usefulness as a primary screening device.
评估2Win偏心式视频验光仪相对于主观验光和台式自动验光的性能。
对86名年龄在20至25岁之间的成年人（46名男性和40名女性受试者）的86只眼睛进行了检查。由三名不同的盲法检查者以随机方式进行主观验光以及使用台式Topcon KR8800和手持式2Win视频验光仪进行自动验光。在大约1周后重复测量以评估仪器的可重复性，并比较不同技术之间的测试间变异性。评估2Win视频验光仪在球镜度数以及柱镜矢量在0度（J0）和45度（J45）时与主观验光和自动验光的一致性。
主观验光、Topcon KR8800和2Win测量的球镜度数的可重复性系数（分别为±0.42、±0.70和±1.18）优于其相应的J0（±1.0、±0.85和±1.66）和J45（±1.01、±0.87和±1.31）矢量分量。Topcon KR8800在平均球镜等效屈光度以及J0和J45矢量分量方面显示出最可重复的值，而球镜分量的可重复性对于主观验光而言最佳。2Win视频验光仪的所有测量的可重复性最低。在两个测量时段中，2Win视频验光仪测量的所有屈光分量与主观验光的结果相比均无显著差异（p>0.05）。在两个测量时段中，Topcon KR8800自动验光仪和2Win视频验光仪测量的球镜度数和平均球镜等效屈光度明显更正（p<0.0001），但J0和J45矢量分量相似（p>0.05）。
平均而言，2Win视频验光仪与主观验光结果比较吻合。2Win视频验光仪的可重复性值比主观验光或自动验光差得多。2Win视频验光仪较大的可重复性范围可能限制了其作为主要筛查设备的实用性。
