Influence of angle Kappa on the optimal intraocular orientation of asymmetric multifocal intraocular lenses
- Sergio Bonaque 1
- Matt T. Jaskulski 2
- David Carmona Ballester 3
- Alicia Cristina Pareja Ríos 4
- J.M. Trujillo Sevilla 1
- 1 Wooptix S.L. San Cristobal de La Laguna, Santa Cruz de Tenerife, Spain
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2
Universidad de Murcia
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3
Universidad de La Laguna
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4
Hospital Universitario de Canarias
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ISSN: 1888-4296
Year of publication: 2021
Volume: 14
Issue: 1
Pages: 78-85
Type: Article
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 angle.