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Optical power distribution of refractive and aspheric multifocal contact lenses: Effect of pupil size

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Madrid Costa, David and Ruiz Alcocer, Javier and García Lázaro, Santiago and Ferrer Blasco, Teresa and Montés Micó, Robert (2015) Optical power distribution of refractive and aspheric multifocal contact lenses: Effect of pupil size. Contact Lens and Anterior Eye, 38 (5). pp. 317-321. ISSN 1367-0484

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Official URL: https://doi.org/10.1016/j.clae.2015.03.008


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Abstract

Purpose
To evaluate the power profile within the optic zone of different designs of multifocal contact lenses (CLs) and to analyze how the effect of pupil size could impact on their optical performance.

Methods
The optical power distribution within the optic zones of multifocal CLs was measured by the Nimo TR1504 (LAMBDA-X, Belgium). The multifocal CLs under study were the Acuvue Bifocal, the Acuvue Oasys for Presbyopia, the PureVision Multifocal and the PureVision 2 for Presbyopia. Each design was considered in all their available addition powers. All lenses had a nominal power of −3.0D. At the same time, three lenses of each model were considered and five consecutive readings of each lens were performed.

Results
The results show that the PureVision Multifocal and the PureVision 2 for Presbyopia have aspheric power profiles. Both designs showed aspheric center-near designs with a smoother progression of the optical power in the PureVision 2 for Presbyopia. The Acuvue Bifocal and the Acuvue Oasys for Presbyopia are shown to have concentric alternating near and far zones. Apart from the refractive rings, the Acuvue Oasys for Presbyopia showed an increase in negative (or less positive) values toward the periphery of the lens.

Conclusions
Besides the refraction, the knowledge of the power profiles of multifocal CLs and the effect of pupil size on the optical distribution of these lenses could be crucial to understand the performance of these designs when they are fitted.


Item Type:Article
Additional Information:

Received 21 October 2014
Received in revised form 16 March 2015
Accepted 23 March 2015
OA de pago: Esta revista dispone de una opción de acceso abierto de pago.

Uncontrolled Keywords:Power profile; In vitro; Pupil diameter Multifocal contact lenses
Subjects:Medical sciences > Medicine > Ophtalmology
Medical sciences > Optics > Contact lenses
Medical sciences > Optics > Optometry
Medical sciences > Optics > Eyes anatomy
ID Code:47751
Deposited On:28 May 2018 08:57
Last Modified:28 May 2018 08:57

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