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Title

Testing vision with angular and radial multifocal designs using Adaptive Optics

AuthorsViñas, María CSIC ORCID; Dorronsoro, Carlos CSIC ORCID; González, Verónica CSIC ORCID; Cortés, Daniel CSIC; Radhakrishnan, A.; Marcos, Susana CSIC ORCID
KeywordsPresbyopia
Spatial Light Modulators
Multifocal corrections
Adaptive optics
Issue Date2-Aug-2016
PublisherElsevier
CitationVision Research 132: 85-96 (2017)
AbstractMultifocal vision corrections are increasingly used solutions for presbyopia. In the current study we have evaluated, optically and psychophysically, the quality provided by multizone radial and angular segmented phase designs. Optical and relative visual quality were evaluated using 8 subjects, testing 6 phase designs. Optical quality was evaluated by means of Visual Strehl-based-metrics (VS). The relative visual quality across designs was obtained through a psychophysical paradigm in which images viewed through 210 pairs of phase patterns were perceptually judged. A custom-developed Adaptive Optics (AO) system, including a Hartmann-Shack sensor and an electromagnetic deformable mirror, to measure and correct the eye¿s aberrations, and a phase-only reflective Spatial Light Modulator, to simulate the phase designs, was developed for this study. The multizone segmented phase designs had 2¿4 zones of progressive power (0 to +3D) in either radial or angular distributions. The response of an ¿ideal observer¿ purely responding on optical grounds to the same psychophysical test performed on subjects was calculated from the VS curves, and compared with the relative visual quality results. Optical and psychophysical pattern-comparison tests showed that while 2-zone segmented designs (angular & radial) provided better performance for far and near vision, 3- and 4-zone segmented angular designs performed better for intermediate vision. AO-correction of natural aberrations of the subjects modified the response for the different subjects but general trends remained. The differences in perceived quality across the different multifocal patterns are, in a large extent, explained by optical factors. AO is an excellent tool to simulate multifocal refractions before they are manufactured or delivered to the patient, and to assess the effects of the native optics to their performance.
Description12 pags., 12 figs.
Publisher version (URL)https://doi.org/10.1016/j.visres.2016.04.011
URIhttp://hdl.handle.net/10261/164074
DOI10.1016/j.visres.2016.04.011
Identifiersdoi: 10.1016/j.visres.2016.04.011
issn: 0042-6989
Appears in Collections:(CFMAC-IO) Artículos

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