Rothschild Foundation, AP-HP Bichat Claude Bernard Hospital, University Paris VII, Paris, France.
J Cataract Refract Surg. 2010 Jan;36(1):28-33. doi: 10.1016/j.jcrs.2009.07.033.
To evaluate the repeatability of measurements with a double-pass system.
Rothschild Foundation, Paris, France.
Eyes were separated into 2 control groups (<30 years old and >40 years), a post-refractive surgery group, and a cataract group. Measurements were performed using the Optical Quality Analysis System. The main outcome measures were the objective scattering index (OSI), the cutoff frequency of the modulation transfer function (MTF), and the Strehl ratio. The repeatability limit was obtained from the individual standard deviations.
Forty-two eyes were evaluated. The mean OSI value was 0.47 +/- 0.11 (SD) in the younger control group, 1.73 +/- 0.26 in the older control group, 1.34 +/- 0.16 in the post-refractive surgery group, and 6.15 +/- 0.50 in the cataract group. The mean cutoff MTF value was 39.44 +/- 3.93 cycles per degree (cpd), 26.07 +/- 3.89 cpd, 28.34 +/- 2.84 cpd, and 13.3 +/- 1.69 cpd, respectively, and the mean Strehl ratio, 0.234 +/- 0.023, 0.146 +/- 0.021, 0.169 +/- 0.023, and 0.098 +/- 0.010, respectively. The repeatability limit for the whole population was 0.841 (33.5%) for the OSI, 8.499 (31.1%) for the cutoff MTF, and 0.051 (31%) for the Strehl ratio.
The repeatability limit was good and equivalent for the OSI, the MTF, and the Strehl ratio values. There was a wide interval between the normal and pathologic threshold for OSI measurements, indicating that the reliability of the double-pass device complies with the requirements for quantitative assessment of scattering.
No author has a financial or proprietary interest in any material or method mentioned.
评估双光系统测量的重复性。
法国巴黎罗斯柴尔德基金会。
将眼睛分为 2 个对照组（<30 岁和>40 岁）、屈光手术后组和白内障组。使用光学质量分析系统进行测量。主要观察指标为客观散射指数（OSI）、调制传递函数（MTF）截止频率和斯特列尔比。重复性限值由个体标准差获得。
共评估 42 只眼。年轻对照组 OSI 值的平均值为 0.47 +/- 0.11（SD），年龄较大对照组为 1.73 +/- 0.26，屈光手术后组为 1.34 +/- 0.16，白内障组为 6.15 +/- 0.50。平均截止 MTF 值分别为 39.44 +/- 3.93 周期/度（cpd）、26.07 +/- 3.89 cpd、28.34 +/- 2.84 cpd 和 13.3 +/- 1.69 cpd，平均斯特列尔比分别为 0.234 +/- 0.023、0.146 +/- 0.021、0.169 +/- 0.023 和 0.098 +/- 0.010。全人群 OSI 的重复性限值为 0.841（33.5%），截止 MTF 为 8.499（31.1%），斯特列尔比为 0.051（31%）。
OSI、MTF 和斯特列尔比的重复性限值良好且相当。OSI 测量的正常和病理阈值之间有很大的间隔，这表明双光设备的可靠性符合散射定量评估的要求。
无作者对任何材料或方法有经济或专有利益。
