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Optical performance of two new trifocal intraocular lenses: through‐focus modulation transfer function and influence of pupil size
Author(s) -
RuizAlcocer Javier,
MadridCosta David,
GarcíaLázaro Santiago,
FerrerBlasco Teresa,
MontésMicó Robert
Publication year - 2014
Publication title -
clinical and experimental ophthalmology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.3
H-Index - 74
eISSN - 1442-9071
pISSN - 1442-6404
DOI - 10.1111/ceo.12181
Subject(s) - optical transfer function , optics , focal length , focus (optics) , intraocular lenses , point spread function , focal point , apodization , cardinal point , pupil , physics , entrance pupil , pupil size , depth of focus (tectonics) , intraocular lens , lens (geology) , paleontology , subduction , biology , tectonics
Background To compare the in vitro optical quality of two new trifocal intraocular lenses at different focal points as a function of pupil size. Methods Two intraocular lenses having different design approaches were evaluated: the AT LISA tri 839 MP with a trifocal diffractive design, and the F ine V ision, which combines two distinct apodized bifocal diffractive profiles resulting in three foci. A PMTF optical bench was used to assess the intraocular lenses' performance, and as optical quality metrics, the through‐focus modulation transfer function was selected; that is, it was measured at 10 focal points and for four different apertures (2.0, 3.0, 3.75 and 4.5 mm). Results For both lenses, the through‐focus curve showed three peaks, corresponding to far, intermediate and near focal point. At the 0.0 D focal point, the F ine V ision yielded better results for larger pupils. At the −1.5 D focal point, both lenses performed worse for larger pupils. At the −3.0 D , the F ine V ision provided better results for all apertures. However, at the −3.5 D focal point, it was the AT LISA tri 839 MP that outperformed the F ine V ision for larger pupils. Conclusions The two trifocal intraocular lenses under analysis have modulation transfer function peaks that correspond to the far, intermediate and near focal points. For larger pupil sizes, the F ine V ision seems to provide better results at far focal points, while the AT LISA tri 839 MP not only provides better results at the intermediate and near focal points, but is also less pupil size‐dependent.