Loop memory of haptic materials in posterior chamber intraocular lenses
Identifieur interne : 001252 ( PascalFrancis/Corpus ); précédent : 001251; suivant : 001253Loop memory of haptic materials in posterior chamber intraocular lenses
Auteurs : Andrea M. Izak ; Liliana Werner ; David J. Apple ; Tamer A. Macky ; Rupal H. Trivedi ; Suresh K. PandeySource :
- Journal of cataract and refractive surgery [ 0886-3350 ] ; 2002.
Descripteurs français
- Pascal (Inist)
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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Pour connaître la documentation sur le format Inist Standard.
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Format Inist (serveur)
NO : | PASCAL 02-0421668 INIST |
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ET : | Loop memory of haptic materials in posterior chamber intraocular lenses |
AU : | IZAK (Andrea M.); WERNER (Liliana); APPLE (David J.); MACKY (Tamer A.); TRIVEDI (Rupal H.); PANDEY (Suresh K.) |
AF : | Center for Research on Ocular Therapeutics and Biodevices, Storm Eye Institute, Medical University of South Carolina/Charleston, South Carolina/Etats-Unis (1 aut., 2 aut., 3 aut., 4 aut., 5 aut., 6 aut.) |
DT : | Publication en série; Niveau analytique |
SO : | Journal of cataract and refractive surgery; ISSN 0886-3350; Coden JCSUEV; Etats-Unis; Da. 2002; Vol. 28; No. 7; Pp. 1229-1235; Bibl. 16 ref. |
LA : | Anglais |
EA : | 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. |
CC : | 002B25B |
FD : | Lentille intraoculaire; Implantation; Chambre postérieure; Méthacrylate de méthyle polymère; Biomatériau; Intraoculaire; Equipement; Fixation; Etude comparative; Homme |
FG : | Chirurgie |
ED : | Intraocular lens; Implantation; Posterior chamber; Methyl methacrylate polymer; Biomaterial; Intraocular; Equipment; Fixation; Comparative study; Human |
EG : | Surgery |
SD : | Lente intraocular; Implantación; Cámara posterior; Metacrilato de metilo polímero; Biomaterial; Intraocular; Equipo; Fijación; Estudio comparativo; Hombre |
LO : | INIST-20937.354000108890470180 |
ID : | 02-0421668 |
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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>
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<server><NO>PASCAL 02-0421668 INIST</NO>
<ET>Loop memory of haptic materials in posterior chamber intraocular lenses</ET>
<AU>IZAK (Andrea M.); WERNER (Liliana); APPLE (David J.); MACKY (Tamer A.); TRIVEDI (Rupal H.); PANDEY (Suresh K.)</AU>
<AF>Center for Research on Ocular Therapeutics and Biodevices, Storm Eye Institute, Medical University of South Carolina/Charleston, South Carolina/Etats-Unis (1 aut., 2 aut., 3 aut., 4 aut., 5 aut., 6 aut.)</AF>
<DT>Publication en série; Niveau analytique</DT>
<SO>Journal of cataract and refractive surgery; ISSN 0886-3350; Coden JCSUEV; Etats-Unis; Da. 2002; Vol. 28; No. 7; Pp. 1229-1235; Bibl. 16 ref.</SO>
<LA>Anglais</LA>
<EA>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.</EA>
<CC>002B25B</CC>
<FD>Lentille intraoculaire; Implantation; Chambre postérieure; Méthacrylate de méthyle polymère; Biomatériau; Intraoculaire; Equipement; Fixation; Etude comparative; Homme</FD>
<FG>Chirurgie</FG>
<ED>Intraocular lens; Implantation; Posterior chamber; Methyl methacrylate polymer; Biomaterial; Intraocular; Equipment; Fixation; Comparative study; Human</ED>
<EG>Surgery</EG>
<SD>Lente intraocular; Implantación; Cámara posterior; Metacrilato de metilo polímero; Biomaterial; Intraocular; Equipo; Fijación; Estudio comparativo; Hombre</SD>
<LO>INIST-20937.354000108890470180</LO>
<ID>02-0421668</ID>
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