科研之友
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摘要
PURPOSE: To evaluate commercially available 1- and 3-piece intraocular lenses (IOLs) with scanning electron microscopy (SEM). %26lt;br%26gt;SETTING: Department of Ophthalmology and Electron Microscopy Center, University Hospital Jena, Jena, Germany. %26lt;br%26gt;DESIGN: Experimental study. %26lt;br%26gt;METHODS: Seven +23.0 diopter IOLs of different design and material and from different manufacturers were chosen for a detailed assessment. Scanning electron microscopy was used at standardized magnifications to assess typical IOL characteristics. The particular focus was the optic edge, the optic surface, the haptic-optic junction, and the haptic. %26lt;br%26gt;RESULTS: All square-edged IOLs had a curvature radius of less than 10 mu m, while the mean optic edge thickness ranged between 216 m and 382 pm. A 360-degree square-edged boundary was present in all 3-piece IOLs and in a single 1-piece model. Relevant production remnants on the optic edge were observed in 1 case. Regarding the haptic, 3-piece IOLs had uniformly shaped fibers with a mean thickness of 177 mu m +/- 51 (SD) (range 116 to 220 mu m). Chemical adhesives were used to attach the haptic in 1 case, where alterations of the IOL material were observed. In another case, the haptic fiber was press-fitted into the optic, which resulted in bulging of the optic profile. Inspection of surface characteristics showed wavelike patterns in 2 IOLs. %26lt;br%26gt;CONCLUSIONS: Taking clinical relevance into account, all IOLs were of high manufacturing quality. Certain attention was paid in creating a sharp optic edge. Surface irregularities of 2 IOLs were attributed to the manufacturing technique. Methods for implementing the haptic-optic junction were diverse.
- 出版日期2013-12
