Abstract
Purpose
To assess the in vitro optical quality of monofocal aspheric toric intraocular lenses (IOLs) as a function of the cylindrical power.
Methods
The in vitro optical quality of the AcrySof IQ Toric IOLs SN6AT2, SN6AT3, SN6AT4, SN6AT5 and SN6AT6 (Alcon Laboratories Inc., Forth Worth, TX, USA) was assessed with an instrument conceived for measuring Zernike’s coefficients at 3.0- and 5.0-mm apertures. As a reference, the aspheric monofocal lens AcrySof IQ Aspheric SN60WF (Alcon Laboratories Inc., Forth Worth, TX, USA) was also measured. The area of visibility and cut-off frequency were used to describe the modulation transfer function (MTF) of each lens; meanwhile, the light in the bucket and the diameter of a circular area centred on the point-spread function (PSF) peak that captures 50% of the light energy were used to describe the PSF of each lens. Finally, an image simulation was computed from the Zernike values with reference purposes.
Results
Small differences were found on the metrics used for describing the MTF and PSF of the lenses at both tested apertures, but these were not statistically significant (p > 0.05). Furthermore, the image simulation showed that these differences would not have clinical relevance at all.
Conclusions
The optical performance of the AcrySof IQ toric IOLs in terms of MTF and PSF is good and seems to be independent of the cylindrical power and similar to a non-toric aspheric lens.
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Funding
The study was supported in part by the “Grups d’Investigació Emergents” Grant funded by the Generalitat Valenciana (GV/2015/046) and the “Atracció de talent” research scholarship (Universitat de València) awarded to Alberto Domínguez-Vicent (UV-INV-PREDOC13-110412). These sponsors had no role in the design or conduct of this research.
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Ferrer-Blasco, T., Domínguez-Vicent, A., García-Lázaro, S. et al. In vitro optical quality of monofocal aspheric toric intraocular lenses: effect of cylindrical power. Int Ophthalmol 38, 933–941 (2018). https://doi.org/10.1007/s10792-017-0537-z
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DOI: https://doi.org/10.1007/s10792-017-0537-z