Trans. Vis. Sci. Tech. | 2EyesVision https://www.2eyesvision.com Seeing is believing Thu, 29 Oct 2026 09:55:57 +0000 en-US hourly 1 https://www.2eyesvision.com/wp-content/uploads/2023/07/cropped-isologo-definitivo-2EyesVision-32x32.png Trans. Vis. Sci. Tech. | 2EyesVision https://www.2eyesvision.com 32 32 Monovision Correction Preference and Eye Dominance Measurements (2023) https://www.2eyesvision.com/monovision-correction-preference-and-eye-dominance-measurements/ https://www.2eyesvision.com/monovision-correction-preference-and-eye-dominance-measurements/#respond Thu, 27 Apr 2023 15:20:25 +0000 https://talentiam-programs.com/?post_type=project&p=22990548

Citation

Rodriguez-Lopez, V.; Barcala, X.; Zaytouny, A.; Dorronsoro, C.; Peli, E.; Marcos, S. (2023); Monovision Correction Preference and Eye Dominance Measurements. Trans. Vis. Sci. Tech. 2023;12(3):18.doi:https://doi.org/10.1167/tvst.12.3.18. For more information, click here.

Abstract

Purpose

To propose new methods for eye selection in presbyopic monovision corrections.

Methods

Twenty subjects with presbyopia performed two standard methods of binary eye dominance identification (sensory with +1.50 diopters [D ]and +0.50 D and sighting with “hole-in-the-card”) and two psychophysical methods of perceived visual quality: (1) the Preferential test, 26 natural images were judged with the near addition in one eye or in the other in a 2-interval forced-choice task, and the Eye Dominance Strength (EDS) defined as the proportion of trials where one monovision is preferred over the other; (2) the Multifocal Acceptance Score (MAS-2EV) test, the perceived quality of a natural images set (for 2 luminance levels and distances) was scored and EDS defined as the score difference between monovision in one eye or the other. Left-eye and right-eye dominance are indicated with negative and positive values, respectively. Tests were performed using a Simultaneous Vision Simulator, which allows rapid changes between corrections.

Results

Standard sensory and sighting dominances matched in only 55% of subjects. The Preferential EDS (ranging from −0.7 to +0.9) and MAS-2EV EDS (ranging from −0.6 to +0.4) were highly correlated. Selecting the eye for far in monovision with the MAS-2EV, sensory, or sighting tests would have resulted in 79%, 64%, and 43% success considering the Preferential test as the gold standard.

Conclusions

Tests based on perceptual preference allow selection of the preferred monovision correction and measurement of dominance strength.

Translational Relevance

The binocular visual simulator allows efficient implementation of eye preference tests for monovision in clinical use.

]]> https://www.2eyesvision.com/monovision-correction-preference-and-eye-dominance-measurements/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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