الفهرس 
Anatomical considerationsOnly 14 pages are availabe for public view
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Abstract
In spite of continual refinements in surgical techniques and the development of new materials for IOL production, posterior capsule opacification (PCO) still remains a major complication of modern cataract surgery.
Several studies have been conducted in an attempt to understand the cellular background and pathogenesis of PCO, aiming at the development of a method for its prevention. These studies have suggested that PCO occurs mainly due to the proliferation, myofibroblastic differentiation and migration of the equatorial lens epithelial cells (LECs) on to the posterior capsule causing wrinkling. Also these cells may swell forming Elshing’s pearls.
On this basis, it was suggested that a discontinuous sharp bend in the capsule created by a sharp edged PMMA capsule tension ring, results in inhibition of migration of LECs and hence decreases the incidence of PCO. In theory, no interspace between the lens optic and posterior capsule would prevent LECs from migrating behind the optic (“no space-no cells”). Capsule tension rings are reported to be effective in reducing these late complications.
Summary and Conclusion
100
This capsule tension ring was used in our study in 30 eyes (group A). It was implanted in the capsular fornix after phacoemulsification and bimanual I/A (through 2 stab corneal incisions) and before the implantation of acrylic PCIOL. The results were compared to those obtained after phacoemlsification and implantation of the same type of PCIOL but without the implantation of the CTR (group B). CTR was implanted using injector after completion of phacoemlsification and meticulous I/A and all patient were examined postoperatively for best-corrected visual acuity and posterior capsule was evaluated for PCO in grades according to density of opacification and fundus visualization.
Results showed that the incidence of PCO was higher in eyes without implantation of CTR (20%) in relation to 6.6% in eyes where CTR was implanted. Open PMMA CTR inhibits fibrotic capsule shrinkage, although not completely
This study showed that incidence of PCO after one year of follow up was less in the eyes who underwent phacoemulsification, CTR implantation and acrylic PCIOL than in the eyes who underwent phacoemulsification and Acrylic PCIOL without the implantation of the CTR.
Summary and Conclusion
101
Although, the results were statistically insignificant, yet these low rates of PCO strongly suggest that the CTR could be an important factor in its prevention. Long term studies are recommended fore more evaluation.