Department of Ophthalmology, Dongguk University, Ilsan Hospital, Koyang, Kyunggido, South Korea.
Curr Eye Res. 2012 Dec;37(12):1091-8. doi: 10.3109/02713683.2012.713158. Epub 2012 Aug 23.
To compare keratometry measurements obtained using an automated keratometer (AK, IOLMaster) and a Scheimpflug keratometer (Pentacam) in predicting residual astigmatism after cataract surgery.
Preoperative corneal astigmatism was calculated using preoperative refraction, an AK and a Scheimpflug keratometer (anterior corneal power [ACP] and true net power [TNP]) in 155 eyes of 107 Asian subjects. Phacoemulsification cataract removal and nontoric intraocular lens insertion (Akreos(®)MI-60™, Bausch & Lomb, Rochester, NY, USA) were performed through a 2.8 mm temporal clear corneal incision. Six months later, postoperative astigmatism (postA) was calculated using manifest refraction. Error angle (EA) and error magnitude (EM) of above keratometries (AK, ACP, and TNP) in prediction of postA was calculated. The correlation between preoperative astigmatism and postA was analyzed using power vectors (J(0) and J(45)).
AK resulted in the lowest EM and ACP resulted in the lowest EA. Preoperative astigmatism (preA) measured using AK, ACP, and TNP showed significant correlation with postA in both J(0) and J(45) components. (AK: rJ(0) = 0.554, rJ(45) = 0.559, ACP: rJ(0) = 0.346, rJ(45) = 0.281, TNP: rJ(0) = 0.409, rJ(45) = 0.231). Preoperative refractive astigmatism showed no significant correlation in any components.
PreA determined using AK showed superior performance in prediction of postA than ACP and TNP.
比较自动角膜曲率计（AK，IOLMaster）和Scheimpflug 角膜地形图仪（Pentacam）测量值在预测白内障手术后残余散光中的作用。
对 107 例亚洲患者的 155 只眼，采用术前验光、AK 和 Scheimpflug 角膜地形图仪（前角膜力[ACP]和真实净力[TNP]）计算术前角膜散光。采用 2.8mm 颞侧透明角膜切口行白内障超声乳化吸除联合非散光人工晶状体（Akreos(®)MI-60™，Bausch & Lomb，罗彻斯特，NY，美国）植入术。术后 6 个月，采用主觉验光计算术后散光（postA）。计算以上三种角膜曲率计（AK、ACP 和 TNP）预测 postA 的误差角（EA）和误差幅度（EM）。采用矢量（J（0）和 J（45））分析术前散光与 postA 的相关性。
AK 的 EM 最低，ACP 的 EA 最低。AK、ACP 和 TNP 测量的术前散光与 J（0）和 J（45）各分量均呈显著相关（AK：rJ(0) = 0.554，rJ(45) = 0.559，ACP：rJ(0) = 0.346，rJ(45) = 0.281，TNP：rJ(0) = 0.409，rJ(45) = 0.231）。术前屈光性散光在任何成分上均无显著相关性。
AK 测量的术前散光在预测 postA 方面优于 ACP 和 TNP。
