HapticV1, Main, Exploration, bibRecordById, Pascal:05-0399248

Clinical application of the lens haptic plane concept with transformed axial lengths

Identifieur interne : 006608 ( Main/Exploration ); précédent : 006607; suivant : 006609

Clinical application of the lens haptic plane concept with transformed axial lengths

Auteurs : Sverker Norrby [Pays-Bas] ; Eva Lydahl [Suède] ; Gabor Koranyi [Suède] ; Mikaela Taube [Suède]

Source :

Journal of cataract and refractive surgery [ 0886-3350 ] ; 2005.

RBID : Pascal:05-0399248

Descripteurs français

Pascal (Inist)
- Application médicale, Cristallin, Plan, Chirurgie, Ophtalmologie, Traitement.
Wicri :
- topic : Plan, Chirurgie.

English descriptors

KwdEn :
- Cornea (anatomy & histology), Eye (anatomy & histology), Humans, Lens, Lens Implantation, Intraocular, Lenses, Intraocular, Medical application, Nomograms, Ophthalmology, Optics and Photonics, Phacoemulsification, Plane, Polymethyl Methacrylate, Prospective Studies, Surgery, Treatment.
MESH :
- chemical : Polymethyl Methacrylate.
- anatomy & histology : Cornea, Eye.
- Humans, Lens Implantation, Intraocular, Lenses, Intraocular, Nomograms, Optics and Photonics, Phacoemulsification, Prospective Studies.

Abstract

Purpose: To clinically evaluate the lens haptic plane (LHP) concept in combination with thick-lens ray tracing for intraocular lens (IOL) power calculation. Setting: St. Erik's Eye Hospital, Stockholm, Sweden. Methods: Prospective study of normal cataract cases implanted with Pharmacia CeeOn 809C IOL. Axial length was measured by A-scan. The measured value was first transformed by addition of a constant value to correct for systematic error. Using the transformed axial length and corneal radius measured by keratometry, the LHP position was determined. Knowing the IOL design and the power implanted, expected refractive outcome was calculated and compared to manifest refraction at 6 weeks in terms of mean absolute error (MAE). Thick-lens ray tracing in the paraxial limit was used for the optical calculation. Results: The mean transformed axial length was 23.87 mm. An LHP position algorithm in linear terms of transformed axial length and corneal radius gave an MAE of 0.38 D. There was no trend with axial length. On the present data, the Holladay 1, Hoffer Q, and SRK/T formulas produced MAEs of 0.39 D, 0.39 D, and 0.41 D, respectively, with optimized formula constants. The differences were not statistically significant (P>.05). Conclusions: The LHP concept in combination with thick-lens ray tracing achieved MAE comparable to that with currently used formulas. The lack of trend with axial length is important for patients with short and long eyes.

Affiliations:

Le document en format XML

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<term>Lens Implantation, Intraocular</term>
<term>Lenses, Intraocular</term>
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<front><div type="abstract" xml:lang="en">Purpose: To clinically evaluate the lens haptic plane (LHP) concept in combination with thick-lens ray tracing for intraocular lens (IOL) power calculation. Setting: St. Erik's Eye Hospital, Stockholm, Sweden. Methods: Prospective study of normal cataract cases implanted with Pharmacia CeeOn 809C IOL. Axial length was measured by A-scan. The measured value was first transformed by addition of a constant value to correct for systematic error. Using the transformed axial length and corneal radius measured by keratometry, the LHP position was determined. Knowing the IOL design and the power implanted, expected refractive outcome was calculated and compared to manifest refraction at 6 weeks in terms of mean absolute error (MAE). Thick-lens ray tracing in the paraxial limit was used for the optical calculation. Results: The mean transformed axial length was 23.87 mm. An LHP position algorithm in linear terms of transformed axial length and corneal radius gave an MAE of 0.38 D. There was no trend with axial length. On the present data, the Holladay 1, Hoffer Q, and SRK/T formulas produced MAEs of 0.39 D, 0.39 D, and 0.41 D, respectively, with optimized formula constants. The differences were not statistically significant (P>.05). Conclusions: The LHP concept in combination with thick-lens ray tracing achieved MAE comparable to that with currently used formulas. The lack of trend with axial length is important for patients with short and long eyes.</div>
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Serveur d'exploration sur les dispositifs haptiques

Clinical application of the lens haptic plane concept with transformed axial lengths

Clinical application of the lens haptic plane concept with transformed axial lengths

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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