Influence of angle Kappa on the optimal intraocular orientation of asymmetric multifocal intraocular lenses
-
Sergio Bonaque-González [4] ; Matt T. Jaskulski [1] ; David Carmona-Ballester [2] ; Alicia Pareja-Ríos [3] ; Juan M. Trujillo-Sevilla [4]
-
[1] Universidad de Murcia
Universidad de Murcia
Murcia, España
-
[2] Universidad de La Laguna
Universidad de La Laguna
San Cristóbal de La Laguna, España
-
[3] Hospital Universitario de Canarias
Hospital Universitario de Canarias
San Cristóbal de La Laguna, España
-
[4] Wooptix S.L. San Cristobal de La Laguna, Santa Cruz de Tenerife, Spain
-
- Localización: Journal of Optometry: peer-reviewed Journal of the Spanish General Council of Optometry, ISSN-e 1888-4296, Vol. 14, Nº. 1, 2021, págs. 78-85
- Idioma: inglés
- Enlaces
-
Resumen
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.
