HapticV1, Main, Exploration, bibRecord, 008B32

Compression forces of haptics of selected posterior chamber lenses

Identifieur interne : 008B32 ( Main/Exploration ); précédent : 008B31; suivant : 008B33

Compression forces of haptics of selected posterior chamber lenses

Auteurs : Olavi P Rssinen [Finlande] ; Jorma R Ty [Finlande] ; Anneli Klemetti ; Anna-Liisa Lyyra [Finlande] ; Jussi Timonen [Finlande]

Source :

Journal of Cataract & Refractive Surgery [ 0886-3350 ] ; 1997.

RBID : ISTEX:713AA36BA203595E1C89770165267A1F4630713E

Descripteurs français

Pascal (Inist)
- Cataracte, Chambre postérieure, Compression, Etude comparative, Force, Haptique, Implantation, Lentille intraoculaire, Modèle simulation.

English descriptors

KwdEn :
- Cataract, Comparative study, Compression, Compressive Strength, Force, Implantation, Intraocular lens, Lens Implantation, Intraocular, Lenses, Intraocular, Posterior chamber, Simulation model.
MESH :
- Compressive Strength, Lens Implantation, Intraocular, Lenses, Intraocular.

Abstract

Purpose: To compare the compressive forces of the haptics of different intraocular lens (IOL) models and analyze the observed differences.Setting: Central Hospital of Central Finland and University of Jyväskylä, Jyväskylä, Finland.Methods: The haptics of 28 IOL models were compressed to a diameter of 9.0 mm. The compression forces were measured at 0.5 mm intervals. The conclusions were verified by numerical simulations of mechanical models of the lenses.Results: The measured forces varied between 100 and 601 mg at a diameter of 11.0 mm, 206 and 1057 mg at a diameter of 10.0 mm, and 315 and 2094 mg at a diameter of 9.0 mm. The slopes of the force curves of the three-piece lenses were fairly linear. In general, the three-piece models were less rigid than one-piece models and underwent plastic deformations after repeated compressions. For most one-piece models, compression force increased progressively with increasing compression. The overall IOL diameter and differences in haptic thickness and length and the angle between optic at the point of haptic insertion were the main causes of the observed differences in the compression forces. The variation in forces between individual specimens of the same model, which occurred with almost all models, were mainly the result of variations in haptic thickness.Conclusion: Great variations in the compression forces of the IOL haptics were found. Compression behaviors should be taken into account when selecting a lens to implant.

Url:

https://api.istex.fr/document/713AA36BA203595E1C89770165267A1F4630713E/fulltext/pdf

DOI: 10.1016/S0886-3350(97)80322-7

Affiliations:

Le document en format XML

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<term>Intraocular lens</term>
<term>Lens Implantation, Intraocular</term>
<term>Lenses, Intraocular</term>
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<front><div type="abstract" xml:lang="en">Purpose: To compare the compressive forces of the haptics of different intraocular lens (IOL) models and analyze the observed differences.Setting: Central Hospital of Central Finland and University of Jyväskylä, Jyväskylä, Finland.Methods: The haptics of 28 IOL models were compressed to a diameter of 9.0 mm. The compression forces were measured at 0.5 mm intervals. The conclusions were verified by numerical simulations of mechanical models of the lenses.Results: The measured forces varied between 100 and 601 mg at a diameter of 11.0 mm, 206 and 1057 mg at a diameter of 10.0 mm, and 315 and 2094 mg at a diameter of 9.0 mm. The slopes of the force curves of the three-piece lenses were fairly linear. In general, the three-piece models were less rigid than one-piece models and underwent plastic deformations after repeated compressions. For most one-piece models, compression force increased progressively with increasing compression. The overall IOL diameter and differences in haptic thickness and length and the angle between optic at the point of haptic insertion were the main causes of the observed differences in the compression forces. The variation in forces between individual specimens of the same model, which occurred with almost all models, were mainly the result of variations in haptic thickness.Conclusion: Great variations in the compression forces of the IOL haptics were found. Compression behaviors should be taken into account when selecting a lens to implant.</div>
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Serveur d'exploration sur les dispositifs haptiques

Compression forces of haptics of selected posterior chamber lenses

Compression forces of haptics of selected posterior chamber lenses

Source :

Descripteurs français

English descriptors

Abstract

Links toward previous steps (curation, corpus...)

Le document en format XML

Pour manipuler ce document sous Unix (Dilib)

Pour mettre un lien sur cette page dans le réseau Wicri

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