Experimental validations of a tunable-lens-based visual demonstrator of multifocal corrections

Akondi, Vyas; Sawides, Lucie; Marrakchi, Yassine; Gambra, Enrique; Marcos, Susana; Dorronsoro, Carlos

doi:10.1364/boe.9.006302

Cited by 17 publications

(25 citation statements)

References 20 publications

(29 reference statements)

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“…In the case of the TF logMAR VA, depth of focus (DOF) was defined as the range of defocus over which the VA is within the 0.2 logMAR of the subject's best possible acuity, following the procedure by Collins et al, 41 which corresponds to a visual Strehl of approximately 0.12. 33,42 The comparison between the real and the SimVissimulated TF performance was expressed in terms of RMS difference of the linearly interpolated TF curves (in a 4.00 D range), taking the real MCLs as the reference. The RMS difference served as a metric for the goodness of the replication of the lens design by the SimVis simulator.…”

Section: Discussionmentioning

confidence: 99%

“…Other differences between performance of physical contact lenses and the simulations may arise from tear film, contact lens fitting or decentrations (not present in SimVis) and mismatch between pupil size. Also, in previous publications (Akondi et al 24,33 ) we discussed limitations to the fact that SimVis relies on temporal multiplexing to represent a spatial variation in the multifocal lens. While the evaluation in prior work was done for intraocular lenses, several conclusions can be extrapolated to contact lenses, particularly regarding the effect of ocular aberrations and pupil size in refractive lens designs.…”

Section: Discussionmentioning

confidence: 99%

“…shows the TF Visual Strehl (VS) of the MCL alone calculated from their power profile, for the MCL of low (+1.25 D, blue), medium (+1.75 D, orange) and high (+2.50 D, gray) adds, respectively. The threshold for functional vision (VS = 0.12)33,42,43 is marked with a horizontal gray dashed line. An…”

mentioning

confidence: 99%

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Optical and Visual Quality With Physical and Visually Simulated Presbyopic Multifocal Contact Lenses

Viñas

Aissati

Gonzalez-Ramos

et al. 2020

Trans. Vis. Sci. Tech.

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As multifocal contact lenses (MCLs) expand as a solution for presbyopia correction, a better understanding of their optical and visual performance becomes essential. Also, providing subjects with the experience of multifocal vision before contact lens fitting becomes critical, both to systematically test different multifocal designs and to optimize selection in the clinic. In this study, we evaluated the ability of a simultaneous vision visual simulator (SimVis) to represent MCLs. Methods: Through focus (TF) optical and visual quality with a center-near aspheric MCL (low, medium and high near adds) were measured using a multichannel polychromatic Adaptive Optics visual simulator equipped with double-pass, SimVis (temporal multiplexing), and psychophysical channels to allow measurements on-bench and in vivo. On bench TF optical quality of SimVis-simulated MCLs was obtained from double-pass (DP) images and images of an E-stimulus using artificial eyes. Ten presbyopic subjects were fitted with the MCL. Visual acuity (VA) and DP retinal images were measured TF in a 4.00 D range with the MCL on eye, and through SimVis simulations of the same MCLs on the same subjects. Results: TF optical (on bench and in vivo) and visual (in vivo) quality measurements captured the expected broadening of the curves with increasing add. Root mean square difference between real and SimVis-simulated lens was 0.031/0.025 (low add), 0.025/0.015 (medium add), 0.019/0.011 (high add), for TF DP and TF LogMAR VA, respectively. A shape similarity metric shows high statistical values (lag κ = 0), rho = 0.811/0.895 (low add), 0.792/0.944 (medium add), and 0.861/0.915 (high add) for TF DP/LogMAR VA, respectively. Conclusions: MCLs theoretically and effectively expand the depth of focus. A novel simulator, SimVis, captured the through-focus optical and visual performance of the MCL in most of the subjects. Visual simulators allow subjects to experience vision with multifocal lenses prior to testing them on-eye. Translational Relevance: Simultaneous visual simulators allow subjects to experience multifocal vision non-invasively. We demonstrated equivalency between real multifocal contact lenses and SimVis-simulated lenses. The results suggest that SimVis is a suitable technique to aid selection of presbyopic corrections in the contactology practice.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

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Optical and Visual Quality With Physical and Visually Simulated Presbyopic Multifocal Contact Lenses

Viñas

Aissati

Gonzalez-Ramos

et al. 2020

Trans. Vis. Sci. Tech.

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“…The focimeter was also used to experimentally measure the output response, that was successfully compared with the predictions of the model. A numerical optimization [35] demonstrated that the compensation of transient response is possible, and experimental measurements proved that applying this compensation represents a significant improvement in the performance of tunable lenses working at high speed.…”

Section: Discussionmentioning

confidence: 99%

“…The final strategy to compensate the transient response was based on automatically generating input waves of higher complexity, using an optimization algorithm (implementing the linear model described in 2.1) to minimize the deviations in the predicted response of the lens [35]. In particular, we minimized the root mean square error between the theoretically estimated response and the target curve, with constrains: the maximum and minimum optical power available, the temporal resolution of the device (Section 2.2) and the sampling of the optical power dynamic range.…”

Section: Model Validation and Compensation Of Transient Responsementioning

confidence: 99%

Tunable lenses: dynamic characterization and fine-tuned control for high-speed applications

Dorronsoro¹,

Barcala²,

Gambra³

et al. 2019

Opt. Express

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Tunable lenses are becoming ubiquitous, in applications including microscopy, optical coherence tomography, computer vision, quality control, and presbyopic corrections. Many applications require an accurate control of the optical power of the lens in response to a time-dependent input waveform. We present a fast focimeter (3.8 KHz) to characterize the dynamic response of tunable lenses, which was demonstrated on different lens models. We found that the temporal response is repetitive and linear, which allowed the development of a robust compensation strategy based on the optimization of the input wave, using a linear time-invariant model. To our knowledge, this work presents the first procedure for a direct characterization of the transient response of tunable lenses and for compensation of their temporal distortions, and broadens the potential of tunable lenses also in high-speed applications.

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Multifocal contact lens vision simulated with a clinical binocular simulator

Barcala¹,

Viñas²,

Ruiz³

et al. 2022

Contact Lens and Anterior Eye

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Experimental validations of a tunable-lens-based visual demonstrator of multifocal corrections

Cited by 17 publications

References 20 publications

Optical and Visual Quality With Physical and Visually Simulated Presbyopic Multifocal Contact Lenses

Optical and Visual Quality With Physical and Visually Simulated Presbyopic Multifocal Contact Lenses

Tunable lenses: dynamic characterization and fine-tuned control for high-speed applications

Multifocal contact lens vision simulated with a clinical binocular simulator

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