Nankivil, D. | 2EyesVision https://www.2eyesvision.com Seeing is believing Wed, 23 Aug 2023 09:44:05 +0000 en-US hourly 1 https://wordpress.org/?v=7.1.3 https://www.2eyesvision.com/wp-content/uploads/2023/07/cropped-isologo-definitivo-2EyesVision-32x32.png Nankivil, D. | 2EyesVision https://www.2eyesvision.com 32 32 Multifocal contact lens vision simulated with a clinical binocular simulator (2022) https://www.2eyesvision.com/multifocal-contact-lens-visual-simulator/ https://www.2eyesvision.com/multifocal-contact-lens-visual-simulator/#respond Tue, 06 Dec 2022 15:19:14 +0000 https://talentiam-programs.com/?post_type=project&p=22988506

Citation

Barcala, X., Vinas, M., Ruiz, S., Hidalgo, F., Nankivil, D., Karkkainen, T., Gambra, E., Dorronsoro, D., & Marcos, S.; Multifocal contact lens vision simulated with a clinical binocular simulator. Contact Lens and Anterior Eye 2022, 45(6):101716. For more information, click here.

Abstract

 

Purpose

The purpose of this study is to compare the binocular visual perception of participants wearing multifocal contact lenses and these same lens designs viewed through a temporal multiplexing visual simulator.

 

Methods

Visual performance and perceived visual quality at various distances were obtained in 37 participants wearing soft M−CLs and through the SimVis Gekko programmed with the same lenses. In a pilot study (n = 10) visual performance was measured in terms of LogMAR visual acuity (VA) at far (4 m), intermediate (64 cm) and near (40 cm) distances and through-focus VA (TFVA) curves with the simulated M−CLs. In the follow-up study (n = 27), LogMAR VA at far, intermediate and near distances were measured both with the actual and simulated M−CLs. Perceived visual quality was measured in both studies using the Multifocal Acceptance Score (MAS-2EV), and a Participants Reported Outcomes Vision questionnaire. Differences between the metrics obtained with simulated and actual lenses were obtained.

 

Results

Both actual and simulated M−CLs increased depth-of-focus by a similar amount. Mean LogMAR VA differences with actual and simulated M−CLs ranged between 4 and 6 letters (0.08 ± 0.01, 0.12 ± 0.01 and 0.10 ± 0.01, for far, intermediate and near distances, respectively). MAS-2EV average score differences with actual and simulated M−CLs ranged between −1.00 and + 4.25. Average MAS-2EV scores were not correlated significantly with VA. However, MAS-2EV (average and individual scores) were highly correlated to visual quality questionnaire responses (p < 0.005).

 

Conclusions

A simultaneous vision simulator accurately represented vision with M−CLs both VA at various distances and perceived visual quality, as measured in a clinical setting. The MAS-2EV metric accurately captured participant reported outcomes of standard vision questionnaires. The combination of SimVis Gekko and MAS-2EV has the potential to largely reduce chair time in M−CLs fitting.

]]> https://www.2eyesvision.com/multifocal-contact-lens-visual-simulator/feed/ 0 Optical and Visual Quality With Physical and Visually Simulated Presbyopic Multifocal Contact Lenses (2020) https://www.2eyesvision.com/presbyopic-multifocal-contact-lenses/ https://www.2eyesvision.com/presbyopic-multifocal-contact-lenses/#respond Thu, 10 Sep 2020 14:28:21 +0000 https://talentiam-programs.com/?post_type=project&p=22988882 Citation

Vinas M, Aissati S, Gonzalez-Ramos A, Romero M, Sawides L, Akondi V, Gambra E, Dorronsoro C, Karkkainen T, Nankivil D, Marcos M; Optical and Visual Quality With Physical and Visually Simulated Presbyopic Multifocal Contact Lenses. Trans. Vis. Sci. Tech. 2020;9(10):20. For more information, click here.

Abstract

Purpose

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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