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S.H. Baumert, F. Fankhauser, II; Secondary Cataract Formation After Implantation of Ultrathin Posterior Chamber Lens . Invest. Ophthalmol. Vis. Sci. 2006;47(13):307.
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Bimanual phacoemulsification procedure requires the implantation of ultrathin posterior chamber lenses through a 1.7 mm corneal incision. However, long term centration as well as secondary cataract formation rates of these newly designed lenses are unknown. It is the goal of this study to investigate these parameters over a 12 month period.
In this prospective study 50 eyes of 45 patients scheduled for routine cataract surgery were implanted with a newly designed hydrophilic acrylate posterior chamber lens (Acrimed MICS 46 CSE, Acrimed, Germany). The lens material consists of a hydrophilic acrylate copolymere with 25 % water content with a hydrophobic surface. Standard cataract surgery with a 3.2 sclero–corneal or corneal incision was performed. Due to the limited resistance of the ultrathin lens to post operative capsular bag shrinkage a newly designed capsular tension ring with a lock that closes when capsular shrinkage occurs, (Acrimed , Acrimed, Germany) was implanted in all cases. Implantation of the lens as well as the ring were performed by specially designed injector systems. IOL centration, secondary cataract formation and subjective disturbance due to halos and glare were monitored post operatively at months 1, 3, 6, 12 and 24. In this study we present the results up to 12 months.
Subjective patient satisfaction was very good in 13.3 % of the patients 4 weeks postoperatively and 42 % at 12 months. 2 patients suffered from significant halos and glare. In 1 patient change of the intraocular lens had to be performed. Discrete secondary cataract formation could be monitored in 21 % of the patients. However only in 1 case visual acquity was reduced which finally led to YAG–laser capsulotomy. IOL centration remained unchanged in all patients.
The MICS 46 CSE intraocular lens qualifies for injection through 1.7 mm incisions. The rate of clinical significant secondary cataract formation within a 12 months follow up seems to be at a comparable level to other commonly used posterior chamber lenses. Due to the combination with a locked capsular tension ring IOL centration remained unchanged. Results of the 24 months follow up will reveal if these findings remain constant.
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