Paul Robert A, Chew Hall F, Singal Neera, Rootman David S, Slomovic Allan R
University of Toronto, Toronto Western Hospital, Toronto, Ontario, Canada.
J Cataract Refract Surg. 2004 Apr;30(4):821-5. doi: 10.1016/j.jcrs.2003.08.008.
To determine the safety and efficacy of implanting a second intraocular lens (IOL) to correct myopic pseudophakic refractive error after penetrating keratoplasty (PKP).
Department of Ophthalmology, Toronto Western Hospital, Toronto, Ontario, Canada.
In this retrospective case series, 6 eyes of 6 post-PKP pseudophakic patients had a second piggyback IOL implantation to correct a residual myopic refractive error. The uncorrected visual acuity (UCVA) and the best corrected visual acuity (BCVA) were measured at regular intervals during a 7-month follow-up. Efficacy was determined by the achieved refractive correction and Snellen UCVA measurements. Safety was measured by loss of BCVA and complications (intraoperative and postoperative).
The UCVA improved in all cases. Five patients achieved a BCVA of 20/40 or better postoperatively. Before surgery, the mean spherical equivalent (SE) was -8.08 diopters (D) (range -6.13 to -12.00 D). After surgery, the mean SE was -0.94 D (range -2.38 to +0.25 D). Four patients were within +/-1.50 D of emmetropia. There were no intraoperative or postoperative complications.
Implanting a piggyback IOL was a safe and effective means of correcting myopic pseudophakic refractive error post PKP.
确定植入第二枚人工晶状体（IOL）以矫正穿透性角膜移植术（PKP）后近视性假晶状体屈光不正的安全性和有效性。
加拿大多伦多安大略省多伦多西部医院眼科。
在这个回顾性病例系列中，6例PKP术后假晶状体患者的6只眼睛接受了第二枚背负式IOL植入，以矫正残余近视屈光不正。在7个月的随访期间定期测量未矫正视力（UCVA）和最佳矫正视力（BCVA）。通过实现的屈光矫正和Snellen UCVA测量来确定疗效。通过BCVA丧失和并发症（术中及术后）来衡量安全性。
所有病例的UCVA均有改善。5例患者术后BCVA达到20/40或更好。手术前，平均球镜当量（SE）为-8.08屈光度（D）（范围为-6.13至-12.00 D）。手术后，平均SE为-0.94 D（范围为-2.38至+0.25 D）。4例患者的屈光不正度数在正视眼的±1.50 D范围内。没有术中或术后并发症。
植入背负式IOL是矫正PKP术后近视性假晶状体屈光不正的一种安全有效的方法。
