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Influence of a capsular tension ring on postoperative anterior chamber depth measured with partial coherence interferometry
Session Title: Biometry
Session Date/Time: Tuesday 08/10/2013 | 08:00-10:30
Paper Time: 09:16
Venue: Elicium 2 (First Floor)
First Author: : M.Weber AUSTRIA
Co Author(s): : N. Hirnschall S. Maedel O. Findl
To evaluate the influence of a capsular tension ring (CTR) on the post-operative anterior chamber depth (ACD).
Vienna Institute for Research in Ocular Surgery, Department of Ophthalmology, Hanusch Hospital, Vienna
This prospective bilateral study included patients who were scheduled for bilateral cataract surgery. After optical biometry (IOLMaster 500, Carl Zeiss Meditec AG, Germany), standard cataract surgery was performed. In all cases a hydrophobic acrylic single piece IOL was used (Tecnis ZCB00, Abbott Medical Optics, USA) and each patient received a CTR in one eye (CTR group) and no CTR in the other eye (no CTR group). ACD measurements were performed using partial coherence interferometry (ACMaster, Carl Zeiss Meditec AG, Germany) pre-operatively, and 1 hour and 12 weeks post-operatively. Additionally, manifest subjective refraction was determined at the 12 week follow-up.
Eighty eyes of 40 patients were included in this study. Three months post-operatively, mean ACD in the CTR and no CTR group was 5.86±1.00mm and 5.94 ±0.94mm, respectively. This difference was not found to be significant (p= 0.57; t-test for paired samples). In 68% of all cases the ACD was deeper in the no CTR group. There was a slightly higher correlation of ACD with pre-operatively measured axial eye length in the CTR group (r²=0,38, p=0,09) in comparison to the no CTR group (r²=0,25, p=0,27). Correlation between pre-operatively measured ACD and 3 months post-operatively measured ACD was r²=0,62 (p=0,002) and r²=0,54 (p=0,01), respectively. Spherical equivalents did not differ significantly between groups 3 months after surgery (p=0,33, t-test for paired samples).
Although there was a trend that implanting a CTR results in a slightly shallower ACD, this trend was not found to be significant.