Stability in the Bag of Foldable Silicone Intraocular Lenses

To examine the stability in the bag in foldable silicone IOL implantation and determine its effect on visual acuity. This study comprised 66 eyes that had phacoemulsification with three-piece foldable silicone intraocular lens(IOL) implantation that were prospectively evaluated about 2 months after surgery. The examination included the status of the haptic and optic placement, extent of posterior capsular capsular opacification(PCO), and the best corrected visual acuity. Sixty-five eyes had an in-in haptic placement, one eye had in-out placement, and there was no eye in out-out placement. Capsular capture occurred in 13 eyes(19.70%). The extent of POC in eyes with capsular capture was greater than in those withot capture. But the best corrected visual acuity in eyes with capsular capture made no difference to those without capture. In addition, eyes with in-out and out-out haptic placement had worse PCO than the eyes with in-in placement. There was a high incidence of capsular capture after silicone IOL implantation. This complication, along with the undesirable placement of the haptics, led tod PCO and was anticipated visual inpairment in long term follow-up. Therefore proper amount of continuous curvilinear capsulorhesix opening and complete placement of lens in the bag ahould be necessary.

Optical Opacity by Interaction of Silicone Material and Silicone Oil in Vitro

Although the results of foldable intraocular lens are generally excellent, there are several complications. After cataract surgery with silicone lens, the patients with vitreoretinal surgery using silicone oil have not only visual acuity decrease, but also visual abberations such as halos and rainbow patterns. To report a newly defined complication, we studied the silicone lens-silicone oil interaction. The nonimplanted ilicone, acryl and PMMA lens, ten cases each, had been incubated in silicon oil at 36C for 9 months. After removal from the oil, each lens was examined and photograp hed by scanning electron microscopy every week. Appearance of lens surface and degree of adherence of the silicone oil to each IOL`s optic were estimated. Oily residue on the PMMA and acryl lens was removed easily and shown clear surface. In case of silicone lens, presence of distinct film or coating of oil was shown on the surface of both the optic and haptic component of IOL`s. They could not be removed with mechanical pressure with injected balanced saline solution and the oily residue remained strongly adherent to the optic surface. After 9 weeks, gelly-like adherence was appe ared on the silicone lens surface. As a result, the use of silicone IOL`s in patients with current vitreoretinal disease or those who are at high risk for future vitreoretinal disease that may require silicone oil as part of the therapy should be reconsidered.

SI-30 NB Silicone IOL Implantation Through 3.2mm Clear Corneal Incision

We examined uncorrected visual acuity, surgically induced astigmatism and complications of 122 eyes underwent cataract surgery with implantation of the AMO Phacoflex SI-30NB. More than 80% of all cases showed uncorrected visual acuity better than 20/40. Temporal incision revealed less surgically induced astigmatism and faster rehabilitation than superior incision. Posterior capsular opacity was found in 14.8%, however Nd-YAG laser capsulotomy was performed in 2.5%. The incidences of contraction of capsular opening and displacement of intraocular lens were 4.9% and 4.1%, respectively. The range of displacement was within 1mm. Conclusively, cataract surgery with implantation of the AMO Phacoflex SI-30NB through clear corneal incision of 3.2mm revealed a low incidence of complication and provided patients rapid visual rehabilitation.