De Groot V, Jonckheere P, Tassignon M J
Department of Ophthalmology, University Hospital, Antwerp, Belgium.
J Cataract Refract Surg. 1997 Oct;23(8):1247-53. doi: 10.1016/s0886-3350(97)80323-9.
To evaluate two intraocular lens (IOL) models with a circular haptic configuration designed to better distribute forces within the capsular bag over 360 degrees.
University and Maria Middelares hospitals, Antwerp, Belgium.
Two IOLs with circular haptics were evaluated for 6 months after implantation: a one-piece, all-poly(methyl methacrylate) (PMMA), Corneal IS M 5.5 lens with a 5.5 mm biconvex optic, overall diameter of 9.8 mm, and two semicircular open haptics (n = 103); a plano-convex, all-PMMA, modified Anis lens with a 5.5 mm plano-convex optic, total diameter of 10.0 or 11.0 mm (depending on diopter), and closed-loop haptics (n = 335). All lenses were inserted through a 5.5 mm scleral incision after phacoemulsification and placed in the capsular bag through a 4.5 mm curvilinear capsulorhexis. The IOLs centered without being rotated.
Six months after implantation, the IOL optics were well centered, even in eyes with an eccentric capsulorhexis (19%). In two eyes with partial zonulysis and in seven with posterior capsule rupture, decentration of less than 0.5 mm was observed. Both lenses provided uniform capsular support without causing stress lines in the posterior capsule. There were no cases of capsule contraction syndrome. Posterior capsule fibrosis reducing visual acuity occurred in 4% of eyes in both series.
The Corneal IS M 5.5 and the Anis lens with circular haptics prevented late optic decentration and, therefore, would be useful in cases of eccentric capsulorhexis, partial zonulysis, anterior radial tears, and posterior capsule rupture. These IOLs may also prevent capsular contraction.
评估两种具有圆形袢设计的人工晶状体（IOL）模型，其旨在更好地在360度范围内将力量分布于囊袋内。
比利时安特卫普的大学医院和玛丽亚·米德雷尔斯医院。
两种带有圆形袢的人工晶状体在植入后进行了6个月的评估：一种是一体式、全聚甲基丙烯酸甲酯（PMMA）材质的Corneal IS M 5.5晶状体，其光学部为5.5毫米双凸面，总直径9.8毫米，有两个半圆形开放式袢（n = 103）；另一种是平凸面、全PMMA材质的改良阿尼斯晶状体，其光学部为5.5毫米平凸面，总直径10.0或11.0毫米（取决于屈光度），有闭环袢（n = 335）。所有晶状体均在超声乳化术后通过5.5毫米巩膜切口插入，并通过4.5毫米曲线形连续环形撕囊放入囊袋内。人工晶状体居中且未发生旋转。
植入6个月后，即使在连续环形撕囊偏心的眼中（19%），人工晶状体光学部也能很好地居中。在两只部分悬韧带溶解和七只后囊破裂的眼中，观察到偏心度小于0.5毫米。两种晶状体均提供了均匀的囊袋支撑，且未在后囊膜上产生应力线。没有出现囊膜收缩综合征的病例。两个系列中均有4%的眼出现后囊膜纤维化导致视力下降。
Corneal IS M 5.5和带有圆形袢的阿尼斯晶状体可防止后期光学部偏心，因此，在连续环形撕囊偏心、部分悬韧带溶解、前部放射状撕裂和后囊破裂的情况下可能有用。这些人工晶状体也可能预防囊膜收缩。
