Shammas Eye Medical Center, Lynwood, California.
University of Southern California, The Keck School of Medicine, Lynwood, California; Shammas Eye Medical Center, Lynwood, California.
Am J Ophthalmol. 2013 Sep;156(3):460-467.e2. doi: 10.1016/j.ajo.2013.04.035. Epub 2013 Jun 28.
To compare the keratometric (K) readings from the Pentacam-HR (High Resolution) unit with the automated K values from the IOLMaster keratometer (KIOLM), and to evaluate them in the commonly used intraocular lens (IOL) power calculation formulas for routine cataract surgery.
Prospective, comparative observational study.
setting: Private practice, Lynwood, California. study population: Fifty cataractous eyes scheduled for surgery between July and August 2012. observation procedure: The K readings from the Pentacam-HR unit taken at the 2-, 3-, 4-, and 5-mm zones and the 2-, 3-, 4-, and 5-mm rings, respectively, from 3 different maps: sagittal corneal front (KF), true net power (KTNP), and total refractive power (KRP) are compared with KIOLM. IOL power calculations were performed with each of the 25 sets of K readings. main outcome measures: The IOL prediction median absolute error (MedAE) obtained with each measurement.
KF averaged 0.03-0.13 diopter (D) higher than KIOLM (P > .05), KTNP averaged 1.16-1.21 D lower than KIOLM (P > .001), and KRP averaged 0.23-0.72 D lower than KIOLM (P > .001), with large variations in the measurements. The MedAE obtained with the different Pentacam K readings ranged from 0.44-0.64 D vs 0.52 D obtained with KIOLM (P > .05). MedAE was lower in all categories when the pupil was 3 mm or smaller.
The Pentacam KF values were the closest to KIOLM and the KF readings from the 2-mm ring yielded the best results for IOL power calculation.
比较 Pentacam-HR(高分辨率)仪的角膜曲率(K)读数与 IOLMaster 角膜曲率计(KIOLM)的自动 K 值,并评估它们在常规白内障手术中常用的人工晶状体(IOL)计算公式中的应用。
前瞻性、对比观察性研究。
地点:加利福尼亚州林伍德的私人诊所。研究人群:2012 年 7 月至 8 月间计划接受手术的 50 只白内障眼。观察程序:分别比较 Pentacam-HR 仪在 2、3、4 和 5mm 区和 2、3、4 和 5mm 环的 3 个不同地图上的 K 读数(矢状角膜前缘(KF)、真实净力(KTNP)和总屈光力(KRP))与 KIOLM 的 K 读数。使用每组 25 个 K 读数中的每一个进行 IOL 功率计算。
每个测量值的 IOL 预测中位数绝对误差(MedAE)。
KF 平均比 KIOLM 高 0.03-0.13 屈光度(D)(P>0.05),KTNP 平均比 KIOLM 低 1.16-1.21 D(P>0.001),KRP 平均比 KIOLM 低 0.23-0.72 D(P>0.001),测量值的差异较大。使用不同的 Pentacam K 读数获得的 MedAE 范围为 0.44-0.64 D,而使用 KIOLM 获得的 MedAE 为 0.52 D(P>0.05)。瞳孔为 3mm 或更小的所有类别中,MedAE 较低。
Pentacam KF 值与 KIOLM 最接近,2mm 环的 KF 读数最适合用于 IOL 功率计算。