Perceptual impact of astigmatism induction in presbyopes

Benedi-Garcia, Clara; Velasco-Ocaña, Miriam; Dorronsoro, Carlos; Pascual, Daniel; Hernández, Martha; Marin, Gildas; Marcos, Susana

doi:10.1016/j.visres.2019.10.008

Cited by 4 publications

(3 citation statements)

References 22 publications

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“…For example, we observed that inducing astigmatism produced a larger visual degradation on non‐astigmatic subjects than on habitually corrected astigmats, with habitually non‐corrected astigmats showing the least sensitivity to astigmatism induction . Similar trends are observed in presbyopes wearing progressive addition lenses, with the stronger effect occurring on presbyopic astigmats . In fact, the shift in best focus upon astigmatism induction differs in against‐the‐rule and with‐the‐rule astigmats, and it also affected by the sign of spherical error of the patient .…”

Section: Vision Applications Of Viobio Adaptive Optics Lab Technologiessupporting

confidence: 52%

“…26,27 Similar trends are observed in presbyopes wearing progressive addition lenses, with the stronger effect occurring on presbyopic astigmats. 28 In fact, the shift in best focus upon astigmatism induction differs in againstthe-rule and with-the-rule astigmats, and it also affected by the sign of spherical error of the patient. 29 Also, while habitually non-corrected astigmats show strong bias towards oriented blur (coincident with the orientation of their retinal blur), the isotropic focus shifts rapidly after astigmatic correction wear, being significant only two hours after correction.…”

Section: Testing Spatial Adaptation With Adaptive Opticsmentioning

confidence: 99%

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VioBio lab adaptive optics: technology and applications by women vision scientists

Marcos

Benedi-Garcia

Aissati

et al. 2020

Ophthalmic Physiologic Optic

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Purpose Adaptive Optics allows measurement and manipulation of the optical aberrations of the eye. We review two Adaptive Optics set‐ups implemented at the Visual Optics and Biophotonics Laboratory, and present examples of their use in better understanding of the role of optical aberrations on visual perception, in normal and treated eyes. Recent findings Two systems (AOI and AOII) are described that measure ocular aberrations with a Hartmann‐Shack wavefront sensor, which operates in closed‐loop with an electromagnetic deformable mirror, and visual stimuli are projected in a visual display for psychophysical measurements. AOI operates in infrared radiation (IR) light. AOII is provided with a supercontiniuum laser source (IR and visible wavelengths), additional elements for simulation (spatial light modulator, temporal multiplexing with optotunable lenses, phase plates, cuvette for intraocular lenses‐IOLs), and a double‐pass retinal camera. We review several studies undertaken with these AO systems, including the evaluation of the visual benefits of AO correction, vision with simulated multifocal IOLs (MIOLs), optical aberrations in pseudophakic eyes, chromatic aberrations and their visual impact, and neural adaptation to ocular aberrations. Summary Monochromatic and chromatic aberrations have been measured in normal and treated eyes. AO systems have allowed understanding the visual benefit of correcting aberrations in normal eyes and the adaptation of the visual system to the eye's native aberrations. Ocular corrections such as intraocular and contact lenses modify the wave aberrations. AO systems allow simulating vision with these corrections before they are implanted/fitted in the eye, or even before they are manufactured, revealing great potential for industry and the clinical practice. This review paper is part of a special issue of Ophthalmic & Physiological Optics on women in visual optics, and is co‐authored by all women scientists of the research team.

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Section: Vision Applications Of Viobio Adaptive Optics Lab Technologiessupporting

confidence: 52%

Section: Testing Spatial Adaptation With Adaptive Opticsmentioning

confidence: 99%

VioBio lab adaptive optics: technology and applications by women vision scientists

Marcos

Benedi-Garcia

Aissati

et al. 2020

Ophthalmic Physiologic Optic

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“…The Visual Strehl ratio calculated from the combined wave aberrations have been shown to correlate well with visual acuity [57,58]. In particular, the defocus determined psychophysically appears to be captured well by the offset of the Visual Strehl peak [11,60], except for bias in the perceived best focus encountered in several refractive profiles, particularly astigmatic patients [61]. However, differences between on bench and in vivo data have been previously reported, without a clear reasoning behind them.…”

Section: Discussionmentioning

confidence: 94%

Understanding In Vivo Chromatic Aberrations in Pseudophakic Eyes Using on Bench and Computational Approaches

et al. 2022

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Diffractive multifocal intraocular lenses (IOLs) modulate chromatic aberration and reduce it at certain distances due to interactions between the refractive and diffractive chromatic components. However, the extent to which computer modeling and on bench measurements of IOL chromatic aberration translate to chromatic aberration in patients implanted with these multifocal IOLs (MIOLs) is not yet fully understood. In this study, we compare the chromatic difference of focus and longitudinal chromatic aberrations in pseudophakic patients implanted with different IOL designs (monofocal and trifocal IOLs) and materials (hydrophobic and hydrophilic), and compared them with predictions from computer eye models and on bench measurements with the same IOLs. Patient data consisted of results from 63 pseudophakic eyes reported in four different studies and obtained psychophysically in the visual testing channel of a custom-developed polychromatic adaptive optics system. Computational predictions were obtained using ray tracing on computer eye models, and modulation transfer function (MTF) on bench measurements on physical eye models. We found that LCA (in vivo/simulated) for far vision was 1.37 ± 0.08 D/1.19 D for monofocal hydrophobic, 1.21 ± 0.08 D/0.88 D for monofocal hydrophilic, 0.99 ± 0.06 D/1.19 D for MIOL hydrophobic, and 0.82 ± 0.05 D/0.88 D for MIOL hydrophilic. For intermediate and near vision, LCA (in vivo/simulated) was 0.67 ± 0.10 D/0.75 D and 0.23 ± 0.08 D/0.19 D for MIOL hydrophobic and 0.27 ± 0.15 D/0.38 D and 0.15 ± 0.15 D/−0.13 D for MIOL hydrophilic, respectively. In conclusion, computational ray tracing and on bench measurements allowed for evaluating in vivo chromatic aberration with different materials and designs for multifocal diffractive intraocular lenses.

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Adaptive optics visual simulators: a review of recent optical designs and applications [Invited]

Marcos¹,

Artal

Atchison

et al. 2022

Biomed. Opt. Express

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In their pioneering work demonstrating measurement and full correction of the eye’s optical aberrations, Liang, Williams and Miller, [JOSA A 14, 2884 (1997)10.1364/JOSAA.14.002884] showed improvement in visual performance using adaptive optics (AO). Since then, AO visual simulators have been developed to explore the spatial limits to human vision and as platforms to test non-invasively optical corrections for presbyopia, myopia, or corneal irregularities. These applications have allowed new psychophysics bypassing the optics of the eye, ranging from studying the impact of the interactions of monochromatic and chromatic aberrations on vision to neural adaptation. Other applications address new paradigms of lens designs and corrections of ocular errors. The current paper describes a series of AO visual simulators developed in laboratories around the world, key applications, and current trends and challenges. As the field moves into its second quarter century, new available technologies and a solid reception by the clinical community promise a vigorous and expanding use of AO simulation in years to come.

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Perceptual impact of astigmatism induction in presbyopes

Cited by 4 publications

References 22 publications

VioBio lab adaptive optics: technology and applications by women vision scientists

VioBio lab adaptive optics: technology and applications by women vision scientists

Understanding In Vivo Chromatic Aberrations in Pseudophakic Eyes Using on Bench and Computational Approaches

Adaptive optics visual simulators: a review of recent optical designs and applications [Invited]

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