Abstract
Purpose
To assess the optical performance of the new EnVista intraocular lens (IOL).
Materials and methods
Four aspheric IOLs were evaluated; the new EnVista is one amoung them. This IOL, similarly to the Z-Flex HB and the Bi-Flex 1.8 667AB ones, has a neutral aspheric design, whereas the fourth IOL under test (AcrySof IQ IOL SN60WF) presents a negative spherical aberration (SA). The IOL’s aberration patterns were measured in vitro, by setting them up on an optical bench. From these aberration-pattern data, the modulation transfer function (MTF), the average modulation values, and the points spread function (PSF) were calculated. Furthermore, in order to assess the potential optical quality that these IOLs would yield once they are implanted, an average corneal-aberration pattern was juxtaposed to the in-vitro profiles and the same parameters were calculated again.
Results
For the IOL-only scenario (ie, without including the corneal factor), it was the EnVista IOL, which is aberration-free that showed the higher MTF, PSF values. This was followed by the other two aberration-free IOL models. However, when the effect of an average corneal pattern was also taken into consideration, the AcrySof IQ IOL SN60WF always outperformed the other neutral-asphericity IOLs.
Conclusions
The in-vitro optical performance of the EnVista IOL was good, but it decreases substantially in a whole-eye scenario, when the wavefront profile of an average cornea is added. Other designs with different degrees of SA should be considered for this IOL in order to surpass these results.
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Acknowledgements
This research was supported in part by a Research Grant (#SAF2009-13342#) of the Ministerio de Ciencia e Innovación (Ministry of Science and Innovation) awarded to Robert Montés-Micó.
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Madrid-Costa, D., Ruiz-Alcocer, J., Ferrer-Blasco, T. et al. In vitro optical performance of a new aberration-free intraocular lens. Eye 28, 614–620 (2014). https://doi.org/10.1038/eye.2014.25
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DOI: https://doi.org/10.1038/eye.2014.25
