Hara Tsutomu, Hara Takeshi, Narita Masaya, Hashimoto Takako, Motoyama Yuta, Hara Takako
Hara Eye Hospital, Utsunomiya, Japan.
Arch Ophthalmol. 2011 Jul;129(7):855-63. doi: 10.1001/archophthalmol.2011.38. Epub 2011 Mar 14.
To confirm the effect of a square-edged, closed endocapsular equator ring (E-ring) for preventing posterior capsular opacification (PCO) after cataract extraction.
Fifty-one eyes underwent cataract surgery associated with E-ring implantation between October 2002 and March 2008. Group 1 included 14 patients (14 eyes) who received an E-ring and intraocular lens (IOL) in 1 eye before March 2006. Their fellow eyes received only an IOL as controls. Group 2 included 23 patients (37 eyes) who received an E-ring and IOL in 1 or both eyes after March 2006 and another 37 age-matched control eyes with only IOL implants. After cataract removal, the E-ring (1.0 mm wide and thick and 9.0 or 9.5 mm long) was implanted in the capsule and an IOL was fixed in the ring. In the control eyes, only an IOL was implanted. The follow-up periods were 2 to 7 years. The PCO value was determined using the Hayashi method.
Two years postoperatively in group 1, the PCO value in the central area of the eyes with an E-ring was significantly lower than in the controls (4.4 vs 11.4, respectively; P = .005). No eyes with an E-ring required Nd:YAG laser posterior capsulotomy postoperatively compared with 23 of 51 control eyes (45%). The posterior capsule in the eyes with an E-ring remained transparent without touching the IOL optic. The 9.5-mm ring fit all eyes.
The 9.5-mm E-ring, which fit all eyes, prevented PCO in human eyes 2 to 7 years postoperatively.
证实方形边缘、封闭的囊内赤道环（E环）在白内障摘除术后预防后囊膜混浊（PCO）的效果。
2002年10月至2008年3月期间，51只眼接受了与E环植入相关的白内障手术。第1组包括14例患者（14只眼），他们在2006年3月之前一只眼接受了E环和人工晶状体（IOL）植入。其对侧眼仅植入IOL作为对照。第2组包括23例患者（37只眼），他们在2006年3月之后一只眼或双眼接受了E环和IOL植入，另有37只年龄匹配的对照眼仅植入IOL。白内障摘除后，将E环（宽和厚均为1.0 mm，长9.0或9.5 mm）植入囊袋内，并将IOL固定在环内。对照眼中仅植入IOL。随访时间为2至7年。使用林氏方法确定PCO值。
第1组术后2年，植入E环的眼中央区域PCO值显著低于对照组（分别为4.4和11.4；P = 0.005）。与51只对照眼中的23只（45%）相比，植入E环的眼中没有一只需要术后进行Nd:YAG激光后囊膜切开术。植入E环的眼后囊膜保持透明，未接触IOL光学部。9.5-mm的环适合所有眼睛。
9.5-mm的E环适合所有眼睛，可在术后2至7年预防人眼的PCO。
