ACRYLIC MATERIAL

The iPure IOL (Physiol), which is composed of a new hydrophobic acrylic IOL material designed to be less prone to glistening, appears to provide an optical performance and intracapsular stability similar to lenses composed of an older hydrophobic material. “Early results reveal a good optic performance compared to a gold standard acrylic IOL. One month postoperatively, subjective refractive outcome and UCVA were satisfying and there were only a few cases of traces of glistenings or surface deposits with both IOLs,” said Sophie Maedel MD, Hanusch Hospital, Vienna, Austria, at the XXXI Congress of the ESCRS in Amsterdam.

Dr Maedel presented results of a randomised, controlled trial involving 50 eyes of 50 patients who underwent implantation of either the new hydrophobic acrylic IOL or a hydrophobic acrylic control IOL (Tecnis ZCB00, AMO) using standard phacoemulsification. Mean target refraction was -0.58 D for the iPure and -0.35 D for the control IOL. In 47 eyes with one month’s followup, the mean absolute difference between subjective spherical refraction and target refraction was 0.54 D for the iPure and 0.49 for the control IOL. The two groups had similar UCVA at 0.09 logMAR for the iPure and 0.06 logMAR (p t-test= 0.60).

She noted that mean BCVA for both groups was 0.0 logMAR. One month postoperatively, there were no glistenings in 87 per cent of the iPure group and 91 per cent of the control group. In all instances the glistenings were found to be mild and may in actual fact have been small cellular deposits on the IOL surface in some cases. There were no cases of PCO.

Double-C-loop

The results of a laboratory study suggest that a new double C-loop haptic lens, the PodEye IOL (PhysIOL), which is made of the same hydrophobic acrylic material as the single C-loop iPure lens may have superior stability within the capsular bag, and may recover its optical properties better than other hydrophobic acrylic lenses, Dimitriya Bozukova PhD, Liege, Belgium told the ESCRS congress. Dr Bozukova and her associates compared the results of four one-piece hydrophobic acrylic IOLs, the double C-loop PodEye, (PhysIOL) and the Envista MX60 (Bausch + Lomb) packed in physiological solution, and the dry-packaged AcrysofR SN60WF (Alcon) and TecnisR ZCB00.

They found that the time required for recovery of 70 per cent of the pre-folding MTF after simulated injection was less than 30 seconds for the PodEye IOL, compared to around three minutes for Acrysof and Tecnis lenses, and more than five minutes for the Envista lens. In addition, in the absence of a posterior capsule, the PodEye and the Tecnis lenses shifted comparably by 1.7mm and 1.6mm, respectively. It was slightly higher than the Acrysof lens (1.0mm) but much better than Envista (2.8mm).

Sophie Maedel: sophie.maedel@gmx.at Dimitriya Bozukoval: d.bozukova@physiol.be