Loop memory of haptic materials in posterior chamber intraocular lenses
Identifieur interne : 007901 ( Main/Merge ); précédent : 007900; suivant : 007902Loop memory of haptic materials in posterior chamber intraocular lenses
Auteurs : Andrea M. Izak [États-Unis] ; Liliana Werner [États-Unis] ; David J. Apple [États-Unis] ; Tamer A. Macky [États-Unis] ; Rupal H. Trivedi [États-Unis] ; Suresh K. Pandey [États-Unis]Source :
- Journal of cataract and refractive surgery [ 0886-3350 ] ; 2002.
Descripteurs français
- Pascal (Inist)
- Wicri :
- topic : Biomatériau, Homme.
English descriptors
- KwdEn :
Abstract
Purpose: To compare the shape recovery ratios after compression of haptic materials used in the manufacture of intraocular lenses (IOLs). Setting: Center for Research on Ocular Therapeutics and Biodevices, Storm Eye Institute, Medical University of South Carolina, Charleston, South Carolina, USA. Methods: The loop memory of 40 silicone-optic posterior chamber lOLs was studied. All the lOLs had modified-C haptics made of poly(methyl methacrylate) (PMMA; n = 10), polyimide (n = 10), polyvinylidene fluoride (PVDF; n = 10), and polypropylene (PP; n = 10). After the overall diameter of each lens was measured (day 0), the lenses were inserted into plastic wells (9.5 mm in diameter) and immersed in water (37°C) for 1 month. They were then placed on an open plate and allowed to reexpand for 2 months. Overall diameter measurements were performed within 5 minutes of the lOLs' removal from the wells and at subsequent time points (days 14, 28, 30, 60, 74, 88, and 95). Results: The loop memory of each lens was expressed as the difference between the initial overall diameter measurement (pretest) and the measurement at each time point; the lower the value, the higher the memory. The overall difference among the 4 groups was statistically significant at each time point (P ≤.001). From days 30 to 95, silicone-PMMA, silicone-elastimide, and silicone-PVDF lOLs had similar loop memory mean values, which were significantly lower than the mean value of silicone-PP lOLs (P <.05). The latter design tended to be deformed after removal from the wells, with increased optic-haptic angulation. Conclusion: Studying the loop memory of haptic materials (PMMA, polyimide, PVDF, and PP) used in the manufacture of posterior chamber lOLs can help surgeons choose an appropriate IOL for each patient.
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Pascal:02-0421668Le document en format XML
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<series><title level="j" type="main">Journal of cataract and refractive surgery</title>
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<profileDesc><textClass><keywords scheme="KwdEn" xml:lang="en"><term>Biomaterial</term>
<term>Comparative study</term>
<term>Equipment</term>
<term>Fixation</term>
<term>Human</term>
<term>Implantation</term>
<term>Intraocular</term>
<term>Intraocular lens</term>
<term>Methyl methacrylate polymer</term>
<term>Posterior chamber</term>
</keywords>
<keywords scheme="Pascal" xml:lang="fr"><term>Lentille intraoculaire</term>
<term>Implantation</term>
<term>Chambre postérieure</term>
<term>Méthacrylate de méthyle polymère</term>
<term>Biomatériau</term>
<term>Intraoculaire</term>
<term>Equipement</term>
<term>Fixation</term>
<term>Etude comparative</term>
<term>Homme</term>
</keywords>
<keywords scheme="Wicri" type="topic" xml:lang="fr"><term>Biomatériau</term>
<term>Homme</term>
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<front><div type="abstract" xml:lang="en">Purpose: To compare the shape recovery ratios after compression of haptic materials used in the manufacture of intraocular lenses (IOLs). Setting: Center for Research on Ocular Therapeutics and Biodevices, Storm Eye Institute, Medical University of South Carolina, Charleston, South Carolina, USA. Methods: The loop memory of 40 silicone-optic posterior chamber lOLs was studied. All the lOLs had modified-C haptics made of poly(methyl methacrylate) (PMMA; n = 10), polyimide (n = 10), polyvinylidene fluoride (PVDF; n = 10), and polypropylene (PP; n = 10). After the overall diameter of each lens was measured (day 0), the lenses were inserted into plastic wells (9.5 mm in diameter) and immersed in water (37°C) for 1 month. They were then placed on an open plate and allowed to reexpand for 2 months. Overall diameter measurements were performed within 5 minutes of the lOLs' removal from the wells and at subsequent time points (days 14, 28, 30, 60, 74, 88, and 95). Results: The loop memory of each lens was expressed as the difference between the initial overall diameter measurement (pretest) and the measurement at each time point; the lower the value, the higher the memory. The overall difference among the 4 groups was statistically significant at each time point (P ≤.001). From days 30 to 95, silicone-PMMA, silicone-elastimide, and silicone-PVDF lOLs had similar loop memory mean values, which were significantly lower than the mean value of silicone-PP lOLs (P <.05). The latter design tended to be deformed after removal from the wells, with increased optic-haptic angulation. Conclusion: Studying the loop memory of haptic materials (PMMA, polyimide, PVDF, and PP) used in the manufacture of posterior chamber lOLs can help surgeons choose an appropriate IOL for each patient.</div>
</front>
</TEI>
<affiliations><list><country><li>États-Unis</li>
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<region><li>Caroline du Sud</li>
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<tree><country name="États-Unis"><region name="Caroline du Sud"><name sortKey="Izak, Andrea M" sort="Izak, Andrea M" uniqKey="Izak A" first="Andrea M." last="Izak">Andrea M. Izak</name>
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<name sortKey="Apple, David J" sort="Apple, David J" uniqKey="Apple D" first="David J." last="Apple">David J. Apple</name>
<name sortKey="Macky, Tamer A" sort="Macky, Tamer A" uniqKey="Macky T" first="Tamer A." last="Macky">Tamer A. Macky</name>
<name sortKey="Pandey, Suresh K" sort="Pandey, Suresh K" uniqKey="Pandey S" first="Suresh K." last="Pandey">Suresh K. Pandey</name>
<name sortKey="Trivedi, Rupal H" sort="Trivedi, Rupal H" uniqKey="Trivedi R" first="Rupal H." last="Trivedi">Rupal H. Trivedi</name>
<name sortKey="Werner, Liliana" sort="Werner, Liliana" uniqKey="Werner L" first="Liliana" last="Werner">Liliana Werner</name>
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