HapticV1, Main, Exploration, bibRecordById, Pascal:04-0296953

Using the lens haptic plane concept and thick-lens ray tracing to calculate intraocular lens power

Identifieur interne : 006A94 ( Main/Exploration ); précédent : 006A93; suivant : 006A95

Using the lens haptic plane concept and thick-lens ray tracing to calculate intraocular lens power

Auteurs : Sverker Norrby [Pays-Bas]

Source :

Journal of cataract and refractive surgery [ 0886-3350 ] ; 2004.

RBID : Pascal:04-0296953

Descripteurs français

Pascal (Inist)
- Cristallin, Plan, Lentille épaisse, Tracé rayon, Lentille intraoculaire, Puissance, Chirurgie, Ophtalmologie, Traitement.
Wicri :
- topic : Plan, Chirurgie.

English descriptors

KwdEn :
- Algorithms, Humans, Intraocular lens, Lens, Lenses, Intraocular, Models, Biological, Ophthalmology, Optics and Photonics, Plane, Power, Ray tracing, Refraction, Ocular, Surgery, Thick lens, Treatment, Visual Acuity.
MESH :
- Algorithms, Humans, Lenses, Intraocular, Models, Biological, Optics and Photonics, Refraction, Ocular, Visual Acuity.

Abstract

Purpose: To develop a methodology for intraocular lens (IOL) power calculation in which the task of predicting the postoperative position of the IOL Is separated from the calculation itself. Setting: Pharmacia, Groningen, The Netherlands. Methods: The minimum biometry input needed for IOL power calculation is the mean anterior corneal radius and axial length of the eye. The lens haptic plane (LHP) is the plane where the IOL haptics make contact with eye tissue. It is an anatomical site (eg, the equator of the capsular bag) and is independent of the IOL model. The position of the IOL optic in relation to the LHP is determined from the exact design of the IOL. Gullstrand's eye model is adopted to obtain the posterior corneal radius, thickness of the cornea, and refractive indices of the eye media. Thick-lens ray tracing in the paraxial limit is used for the optical calculation. Results: A spreadsheet is given for the calculation. Conclusions: The methodology developed allows for IOL power calculation from first principles (ie, using true physical distances, radii, and refractive indices as input for the optical calculation).

Affiliations:

Le document en format XML

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<author><name sortKey="Norrby, Sverker" sort="Norrby, Sverker" uniqKey="Norrby S" first="Sverker" last="Norrby">Sverker Norrby</name>
<affiliation wicri:level="3"><inist:fA14 i1="01"><s1>Pharmacia</s1>
<s2>Groningen</s2>
<s3>NLD</s3>
<sZ>1 aut.</sZ>
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<country>Pays-Bas</country>
<placeName><settlement type="city">Groningue</settlement>
<region nuts="2" type="province">Groningue (province)</region>
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<series><title level="j" type="main">Journal of cataract and refractive surgery</title>
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<seriesStmt><title level="j" type="main">Journal of cataract and refractive surgery</title>
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<term>Humans</term>
<term>Intraocular lens</term>
<term>Lens</term>
<term>Lenses, Intraocular</term>
<term>Models, Biological</term>
<term>Ophthalmology</term>
<term>Optics and Photonics</term>
<term>Plane</term>
<term>Power</term>
<term>Ray tracing</term>
<term>Refraction, Ocular</term>
<term>Surgery</term>
<term>Thick lens</term>
<term>Treatment</term>
<term>Visual Acuity</term>
</keywords>
<keywords scheme="MESH" xml:lang="en"><term>Algorithms</term>
<term>Humans</term>
<term>Lenses, Intraocular</term>
<term>Models, Biological</term>
<term>Optics and Photonics</term>
<term>Refraction, Ocular</term>
<term>Visual Acuity</term>
</keywords>
<keywords scheme="Pascal" xml:lang="fr"><term>Cristallin</term>
<term>Plan</term>
<term>Lentille épaisse</term>
<term>Tracé rayon</term>
<term>Lentille intraoculaire</term>
<term>Puissance</term>
<term>Chirurgie</term>
<term>Ophtalmologie</term>
<term>Traitement</term>
</keywords>
<keywords scheme="Wicri" type="topic" xml:lang="fr"><term>Plan</term>
<term>Chirurgie</term>
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<front><div type="abstract" xml:lang="en">Purpose: To develop a methodology for intraocular lens (IOL) power calculation in which the task of predicting the postoperative position of the IOL Is separated from the calculation itself. Setting: Pharmacia, Groningen, The Netherlands. Methods: The minimum biometry input needed for IOL power calculation is the mean anterior corneal radius and axial length of the eye. The lens haptic plane (LHP) is the plane where the IOL haptics make contact with eye tissue. It is an anatomical site (eg, the equator of the capsular bag) and is independent of the IOL model. The position of the IOL optic in relation to the LHP is determined from the exact design of the IOL. Gullstrand's eye model is adopted to obtain the posterior corneal radius, thickness of the cornea, and refractive indices of the eye media. Thick-lens ray tracing in the paraxial limit is used for the optical calculation. Results: A spreadsheet is given for the calculation. Conclusions: The methodology developed allows for IOL power calculation from first principles (ie, using true physical distances, radii, and refractive indices as input for the optical calculation).</div>
</front>
</TEI>
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Serveur d'exploration sur les dispositifs haptiques

Using the lens haptic plane concept and thick-lens ray tracing to calculate intraocular lens power

Using the lens haptic plane concept and thick-lens ray tracing to calculate intraocular lens power

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

	Serveur d'exploration sur les dispositifs haptiques
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