Savini Giacomo, Barboni Piero, Profazio Vincenzo, Zanini Maurizio, Hoffer Kenneth J
Private practice, Bologna, Italy.
J Cataract Refract Surg. 2008 May;34(5):809-13. doi: 10.1016/j.jcrs.2008.01.012.
To evaluate corneal power measurements by a rotating Scheimpflug camera (Pentacam, Oculus) in eyes that have had myopic excimer laser surgery.
Private practice, Bologna, Italy.
This prospective comparative interventional case series comprised 16 eyes of 16 patients who had myopic excimer laser surgery and for whom all perioperative data were available. Four corneal power measurements obtained with the Pentacam (simulated keratometry, true net power, equivalent K reading, and BESSt formula) were analyzed and compared with values derived using the clinical history method and 2 other formulas for calculating corneal power after refractive surgery (modified keratometric refractive index according to Savini et al. and separate consideration of the anterior and posterior corneal curvatures according to Speicher).
Analysis of variance showed a statistically significant difference between all methods (P<.0001). Bonferroni multiple comparison tests showed that the only Pentacam measurements not statistically different from the corneal power values derived using the clinical history method were the equivalent K readings at 1.0 mm, 2.0 mm, and 3.0 mm and those derived with the BESSt formula; however, considerably large 95% limits of agreement (LoA) were calculated between each of these values and those obtained with the clinical history method.
The Pentacam device gave corneal power measurements that did not statistically significantly had differ from those predicted by the clinical history method in eyes that had previous myopic excimer laser surgery. Wide LoA are a potential source of error in intraocular lens power calculation in such patients.
评估使用旋转式Scheimpflug相机（Pentacam，Oculus）对接受过准分子激光近视手术的眼睛进行角膜屈光力测量的情况。
意大利博洛尼亚的私人诊所。
该前瞻性比较干预性病例系列包括16例接受过准分子激光近视手术且所有围手术期数据均可用的患者的16只眼睛。分析了使用Pentacam获得的四项角膜屈光力测量值（模拟角膜曲率计测量值、真实净屈光力、等效K读数和BESSt公式），并与使用临床病史法得出的值以及屈光手术后计算角膜屈光力的其他两个公式（根据Savini等人的改良角膜曲率计屈光指数以及根据Speicher分别考虑前后角膜曲率）进行比较。
方差分析显示所有方法之间存在统计学上的显著差异（P<0.0001）。Bonferroni多重比较检验表明，与使用临床病史法得出的角膜屈光力值在统计学上无差异的唯一Pentacam测量值是1.0 mm、2.0 mm和3.0 mm处的等效K读数以及使用BESSt公式得出的读数；然而，在这些值中的每一个与使用临床病史法获得的值之间计算出了相当大的95%一致性界限（LoA）。
在接受过准分子激光近视手术的眼睛中，Pentacam设备给出的角膜屈光力测量值与临床病史法预测的值在统计学上无显著差异。在这类患者的人工晶状体屈光力计算中，较宽的LoA是误差的一个潜在来源。
