Article
Manufacturing quality of commercially available single- and three-piece intraocular lenses (K)
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Authors
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Tobias Brockmann
- Charité - University Medicine Berlin, Department of Ophthalmology, Berlin
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Claudia Steger
- Charité - University Medicine Berlin, Department of Ophthalmology, Berlin
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Sandor Nietzsche
- University Hospital Jena, Electron Microscopy Center, Jena
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Eckart Bertelmann
- Charité - University Medicine Berlin, Department of Ophthalmology, Berlin
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Jürgen Strobel
- University Hospital Jena, Department of Ophthalmology, Jena
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Jens Dawczynski
- University of Leipzig, Faculty of Medicine, Department of Ophthalmology and Eye Hospital, Leipzig
| Published: | October 18, 2013 |
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Outline
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Purpose: To investigate the manufacturing quality of commercially available single- and three-piece intraocular lenses (IOL).
Methods: Seven +23.0 diopter (D) IOLs of different manufacture, design and material were chosen for a detailed assessment. Scanning electron microscopy was used at uniform magnifications to assess IOL characteristics. In particular, we focused on the optic edge, the optic surface, the haptic-optic junction and the haptic.
Results: All square-edge IOLs had curvature radii less than 10 µm while the mean optic edge thickness ranged between 216 µm and 382 µm. A 360-degree square-edge boundary was present in all three-piece and in one single-piece model. Relevant production remnants on the optic edge were observed in one case. Regarding the haptics, three-piece IOLs presented uniformly shaped fibers with an average thickness of 177±51 µm, ranging from 116 µm to 220 µm. Chemical adhesives were used to attach the haptic in one case, consequently alterations on the lens material were observed. In another case, the haptic fiber was press-fitted into the optic, which resulted in a bulging of the optic profile. The inspection of the surface characteristics revealed wave-like patterns in two IOLs.
Conclusions: Taking the clinical relevance into account, all IOLs presented high manufacturing quality. Certain attention was paid in creating a sharp optic edge. Surface irregularities on two IOLs were attributed to the used manufacturing technique. A broad diversity was observed on approaches used for implementing the haptic-optic junction.
