双通道系统视觉质量分析仪评价正常人视觉质量的可重复性研究

目的 探讨双通道系统视觉质量分析仪（optical quality analysis system, OQAS）评价正常人客观视觉质量的可重复性。 设计 诊断技术评价。 研究对象 26例（48眼）除屈光不正外无其他眼病的正常成年人。方法 在相同的测试条件下，由同一测试者采用OQAS对研究对象进行视觉质量的检查，连续测量10次，检查视觉质量参数6种，包括调制传递函数的截止点（MTFcutoff）、斯特列尔比值（Strehl2D ratio）、对比度为100%、20%、9%时的OV值（OV100%、 OV20%、 OV9%）以及客观散射指数（OSI）。利用SAS软件计算重复性限（RL）值。主要指标 6种OQAS参数的重复性限值（RL）。 结果 受试者的平均MTFcutoff、Strehl2D ratio、OV100%、OV20%、OV9%和OSI 分别为39.55±10.99、0.23±0.07、1.32±0.37、1.36±0.46、1.38±0.52和0.70±0.43，其RL值（百分比数值）分别为17.74%、24.95%、17.74%、20.59%、23.31%和37.07%。结论 双通道系统视觉质量分析仪作为评价正常人客观视觉质量的检查方法具有良好的可重复性。

The repeatability of objective optical quality parameters measured by the Optical Quality Analysis System in normal subjects

 Objective To evaluate intra-session repeatability of objective optical quality parameters measured by the Optical Quality Analysis System (OQAS). Design Evaluation of diagnostic technology. Participants Twenty-six Chinese healthy adults (48 eyes) aged 18 to 41-years old (11 males and 15 females) were enrolled. Method Optical quality of each subject was evaluated by the OQAS with the pupil diameter of 4.0 mm. Ten consecutive measurements of the following parameters: the modulation transfer function cutoff frequency (MTFcutoff), the Strehl2D ratio, the OQAS values (OVs) at contrasts of 100%, 20%, 9% and the objective scatter index (OSI), were performed by one experienced examiner. The repeatability limit (RL) of each parameter was evaluated using SAS software. Main Outcome Measures The RLs of the six parameters of OQAS. Results The MTFcutoff , Strehl2D ratio, OV100%, OV20%, OV9% and OSI of the participants was 39.55±10.99, 0.23±0.07, 1.32±0.37, 1.36±0.46, 1.38±0.52, and 0.70±0.43, respectively. The RLs (percentage) of which were 17.74%, 24.95%, 17.74%, 20.59%, 23.31%, and 37.07%, respectively. Conclusion Measurements of objective optical quality provided by OQAS showed a good repeatability in normal subjects.