Findl O, Drexler W, Menapace R, Georgopoulos M, Rainer G, Hitzenberger C K, Fercher A F
Universitätsklinik für Augenheilkunde, Allgemeines Krankenhaus Wien, Austria.
J Cataract Refract Surg. 1999 May;25(5):659-62. doi: 10.1016/s0886-3350(99)00010-3.
To quantify changes in intraocular lens (IOL) position caused by neodymium: YAG (Nd:YAG) capsulotomy with 3 IOL styles.
Department of Ophthalmology, University of Vienna, Austria.
In a prospective study, anterior chamber depth (ACD) was measured by dualbeam partial coherence interferometry (PCI) in 32 pseudophakic eyes of 32 patients with posterior capsule opacification before and immediately after planned capsulotomy under mydriasis. Patients were divided into 3 groups with the following IOL styles: 1-piece poly(methyl methacrylate) (PMMA), 3-piece foldable, and plate haptic.
The capsulotomy induced a backward IOL movement in all 32 eyes (mean 25 microns; range 9 to 55 microns). It was more pronounced in eyes with plate-haptic IOLs than in those with the other styles. Precision of ACD measurement by PCI was 4 microns. Changes in ACD correlated significantly with capsulotomy size but not with preoperative lens-capsule distance.
Capsulotomy caused a backward movement of the IOL, which was more pronounced with plate-haptic IOLs than with 1-piece PMMA and 3-piece foldable IOLs. Since the magnitude of IOL movement in this study population was small, a hyperopic shift in refraction after capsulotomy will usually be small and not clinically relevant.
量化三种人工晶状体（IOL）类型在钕：钇铝石榴石（Nd：YAG）晶状体后囊切开术后人工晶状体位置的变化。
奥地利维也纳大学眼科。
在一项前瞻性研究中，对32例后囊膜混浊患者的32只人工晶状体眼，在散瞳下计划行晶状体后囊切开术前及术后即刻，采用双光束部分相干干涉测量法（PCI）测量前房深度（ACD）。患者被分为3组，分别植入以下类型的人工晶状体：单片聚甲基丙烯酸甲酯（PMMA）、三片可折叠式和板袢式。
晶状体后囊切开术导致所有32只眼的人工晶状体向后移动（平均25微米；范围9至55微米）。板袢式人工晶状体眼的移动比其他类型的更明显。PCI测量ACD的精度为4微米。ACD的变化与晶状体后囊切开术的大小显著相关，但与术前晶状体-囊膜距离无关。
晶状体后囊切开术导致人工晶状体向后移动，板袢式人工晶状体的移动比单片PMMA和三片可折叠式人工晶状体更明显。由于本研究人群中人工晶状体移动的幅度较小，晶状体后囊切开术后屈光的远视偏移通常较小且无临床相关性。
