Wear effects on microscopic morphology and hyaluronan uptake in siloxane-hydrogel contact lenses
| Autor: | Stefano Farris, Federica Cozza, Miriam Ascagni, Matteo Fagnola, Lorenzo Ferraro, Martina Tonveronachi, Alessandro Borghesi, Silvia Tavazzi |
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| Rok vydání: | 2014 |
| Předmět: |
Materials science
Scanning electron microscope Biomedical Engineering Penetration (firestop) law.invention Biomaterials Contact lens chemistry.chemical_compound chemistry Confocal microscopy law Siloxane Hyaluronic acid Polymer chemistry Self-healing hydrogels medicine Composite material Swelling medicine.symptom |
| Zdroj: | Journal of Biomedical Materials Research Part B: Applied Biomaterials. 103:1092-1098 |
| ISSN: | 1552-4973 |
| DOI: | 10.1002/jbm.b.33278 |
| Popis: | The purpose of this study was a comparison between new and worn siloxane-hydrogel contact lenses in terms of microscopic structure, surface morphology, and loading of hyaluronan. The analyses were performed by scanning electron microscopy, with the support of the freeze-drying technique, and by fluorescence confocal microscopy. Along the depth profile of new lenses, a thin porous top layer was observed, which corresponds to the region of hyaluronan penetration inside well-defined channels. The time evolution was followed from one day to two weeks of daily wear, when a completely different scenario was found. Clear experimental evidence of a buggy surface was observed with several crests and regions of swelling, which could be filled by the hyaluronan solution. The modifications are attributed to the progressive relaxation of the structure of the polymeric network. © 2014 Wiley Periodicals, Inc. J Biomed Mater Res Part B: Appl Biomater, 103B: 1092–1098, 2015. |
| Databáze: | OpenAIRE |
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