Influence of angle Kappa on the optimal intraocular orientation of asymmetric multifocal intraocular lenses
J. optom. (Internet)
; 14(1): 78-85, ene.-mar. 2021. ilus, tab, graf
Article
in English
| IBECS
| ID: ibc-200295
Responsible library:
ES1.1
Localization: BNCS
ABSTRACT
PURPOSE:
to evaluate the effects of kappa angle and intraocular orientation on the theoretical performance of asymmetric multifocal intraocular lenses (MIOL).METHODS:
For a total of 21 corneal aberrations, a computational analysis simulated the implantation of a computationally designed MIOL. An image quality parameter (IQ) (visually modulated transfer function metric) was calculated for a 5.0-mm pupil and for three conditions distance, intermediate, and near vision. The procedure was repeated for each eye after a rotation of the MIOL with respect to the cornea from 0º to 360º in 5º steps. Kappa angles from 0 to 900 microns, in 150 microns steps, combined with two two variants of MIOL centration were tested in the corneal apex or in the center of the entrance pupil. A p-value ≤ 0.05 was considered significant.RESULTS:
There were statistically significant differences of the IQ depending of the intraocular orientation of the MIOL. If kappa angle was increased, there was a statistically significant decrease of the IQ. The IQ maintained stable when the optimal intraocular orientation was re-calculated for each kappa angle. In general, the inter-variability of the results between subjects was very high. There were no strong evidences supporting that there exists a preferable centration point.CONCLUSIONS:
Our results suggest that kappa angle theoretically affects significantly the performance of asymmetric MIOL implantation. However, its negative effect can be compensated if a customized intraocular orientation is calculated taking into account the presence of the kappa angleRESUMEN
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Full text:
Available
Collection:
National databases
/
Spain
Database:
IBECS
Main subject:
Corneal Wavefront Aberration
/
Patient-Specific Modeling
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Multifocal Intraocular Lenses
Limits:
Aged
/
Female
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Humans
/
Male
Language:
English
Journal:
J. optom. (Internet)
Year:
2021
Document type:
Article
Institution/Affiliation country:
Hospital Universitario de Canarias/Spain
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University of La Laguna/Spain
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University of Murcia/Spain
/
Wooptix S.L/Spian