Binocular summation and visual function with induced anisocoria and monovision

Castro, José J.; Soler, Margarita; Ortíz, Carolina; Jiménez, José María López; Anera, Rosario G.

doi:10.1364/boe.7.004250

Cited by 16 publications

(27 citation statements)

References 32 publications

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“…However, a recent meta-analysis by Baker and Lygo indicates that the ratio between binocular and monocular perception may be higher, implying a multifactorial mechanism underlying this process [ 28 ]. Conversely, the binocular summation may also be hampered, e.g., under monovision correction, with the ratio close to or less than 1 indicating the deterioration of binocular vision [ 29 , 30 ]. If we assume that the binocular summation is 1 for the RayOne EMV and for other IOLs, the far-focus wOTF b increases for all models but one (Fig.…”

Section: Discussionmentioning

confidence: 99%

Laboratory Investigation of Preclinical Visual-Quality Metrics and Halo-Size in Enhanced Monofocal Intraocular Lenses

et al. 2021

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Introduction: This study aims to compare preclinical visual-quality metrics and halo size of intraocular lenses (IOL) with enhanced intermediate vision to a standard monofocal lens. Methods: Three monofocal-IOL models with an extended-depth-of-focus (EDoF) intended for monocular implantation (Tecnis ICB00, AE2UV/ZOE, and IsoPure) and one for monovision (RayOne EMV) were compared against a standard monofocal lens (Tecnis ZCB00). An optical-metrology station was used in the assessment of IOLs' optical quality in polychromatic light. The imaging quality was compared with metrics derived from the optical transfer function. Halo size was estimated from the projection of the point spread function under scotopic pupil. Results: The monofocal IOL showed the highest image quality at the far focus. The ICB00's, the AE2UV/ZOE's, and the IsoPure's performance at -1D was superior to that of the monofocal lens. The monocular defocus tolerance of the RayOne EMV was comparable with that of the ZCB00. The RayOne EMV's intermediate range was improved in a monovision configuration (-1D offset). This approach, however, yielded the largest halo area, i.e., 53% of the ZCB00's halo, compared to 34% for the IsoPure, 14% for the AE2UV/ZOE, and 8% for the ICB00. Conclusion:The mono-EDoF models have a clear advantage over the standard monofocal lens by expanded imaging capability beyond -0.5D. Although the RayOne EMV provided the largest (binocular) visual-range extension, it was at the expense of monocular vision and higher susceptibility to halo. The ICB00's and the AE2UV/ZOE's halo-profile was similar to that of the ZCB00, indicating their low potential to induce photic phenomena.

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Section: Discussionmentioning

confidence: 99%

Laboratory Investigation of Preclinical Visual-Quality Metrics and Halo-Size in Enhanced Monofocal Intraocular Lenses

et al. 2021

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“…At a neural level, feed-forward activity in the primary visual area and feedback activity in extrastriate areas (C1 and N1) are reduced whereas, other brain activities in both extrastriate visual areas (the P1 component) and in the anterior insula (the pP1 component) are increased to compensate, suggesting fluid brain adaptation in visual and non-visual areas (Zeri et al, 2018). There is a deterioration of the binocular vision when inducing anisocoria with a higher perception of halos, a lower contrast sensitivity and poorer binocular summation (Castro et al, 2016). Recent research confirms that simulated anisometropia (as induced by monovision) reduces stereoacuity proportional to the intraocular difference in vergence and that the effect is equivalent whether induced in the dominant or non-dominant eye (Nabie et al, 2017), despite the fact that the near addition is traditionally added to the non-dominant eye.…”

Section: Presbyopic Correction Strategiesmentioning

confidence: 98%

Presbyopia: Effectiveness of correction strategies

Wolffsohn

Davies

2019

Progress in Retinal and Eye Research

211

178

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Presbyopia is a global problem affecting over a billion people worldwide. The prevalence of unmanaged presbyopia is as high as 50% of those over 50 years of age in developing world populations, due to a lack of awareness and accessibility to affordable treatment, and is even as high as 34% in developed countries. Definitions of presbyopia are inconsistent and varied, so we propose a redefinition that states "presbyopia occurs when the physiologically normal age-related reduction in the eye's focusing range reaches a point, when optimally corrected for distance vision, that the clarity of vision at near is insufficient to satisfy an individual's requirements". Strategies for correcting presbyopia include separate optical devices located in front of the visual system (reading glasses) or a change in the direction of gaze to view through optical zones of different optical powers (bifocal, trifocal or progressive addition spectacle lenses), monovision (with contact lenses, intraocular lenses, laser refractive surgery and corneal collagen shrinkage), simultaneous images (with contact lenses, intraocular lenses and corneal inlays), pinhole depth of focus expansion (with intraocular lenses, corneal inlays and pharmaceuticals), crystalline lens softening (with lasers or pharmaceuticals) or restored dynamics (with 'accommodating' intraocular lenses, scleral expansion techniques and ciliary muscle electrostimulation); these strategies may be applied differently to the two eyes to optimise the range of clear focus for an individual's task requirements and minimise adverse visual effects. However, none fully overcome presbyopia in all patients. While the restoration of natural accommodation or an equivalent remains elusive, guidance is given on presbyopic correction evaluation techniques.

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“…Similarly, the binocular summation for the CSF, BS CSF , was determined according to Equation ( 2), dividing the binocular CSF value, CSF bin , by the best monocular value, 27,69,71 CSF best_mon Next, the binocular summation for the VDI, BS VDI , was calculated using Equation (3), dividing the lowest monocular value, VDI best_mon , by the binocular VDI value, VDI bin , since the VDI decreases when the discrimination capacity increases. 9 A binocular summation ratio above 1 indicates positive binocular summation, proving the superiority of the binocular system with respect to monocular viewing, whereas a value of less than 1 shows the superiority of the better eye measured monocularly, and inhibition of the binocular system.…”

Section: Binocular Summationmentioning

confidence: 99%

Effect of interocular differences on binocular visual performance after inducing forward scattering

Martino

Torres

Casares-López

et al. 2022

Ophthalmic Physiologic Optic

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To assess binocular visual performance by means of binocular summation on visual function after inducing monocular forward scattering, and to study the influence of interocular differences on ocular parameters. Methods:Seven young healthy subjects were recruited. Four Bangerter foils and five fog filters were used to induce monocular forward scattering. To analyse the impact of the scatter, visual acuity, contrast sensitivity, visual discrimination capacity and distance stereoacuity were measured binocularly with the filter placed over the dominant eye. Additionally, interocular differences were calculated for four ocular parameters: the Objective Scatter Index (OSI), Strehl ratio (SR), modulation transfer function cut-off (MTF cut off) and straylight (log[s]). Binocular summation was determined for these visual functions.Results: A statistically significant deterioration in visual acuity, contrast sensitivity and stereoacuity was seen for all of the filter conditions with respect to the natural state (baseline), with the largest change being recorded for the Bangerter foils.Similarly, the interocular difference for the three retinal image quality parameters (OSI, SR and MTF cut-off) and log(s) increased significantly for the Bangerter foil condition, but not for the fog filters (except log(s)). Binocular summation declined gradually with the Bangerter foils, but not for the fog filters. Statistically significant correlations were found, that is, the greater the interocular differences, the lower the binocular summation of the visual functions and the greater the distance stereoacuity. Conclusion:Increased forward scattering in the dominant eye resulted in interocular differences, which reduced the overall binocular visual performance, including the binocular summation of several visual functions and distance stereoacuity. The results suggest that marked interocular differences in ocular parameters should be avoided in cases of ocular pathology, amblyopia and emmetropisation procedures (such as refractive surgery) or a monovision correction for presbyopia.

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Binocular summation and visual function with induced anisocoria and monovision

Cited by 16 publications

References 32 publications

Laboratory Investigation of Preclinical Visual-Quality Metrics and Halo-Size in Enhanced Monofocal Intraocular Lenses

Laboratory Investigation of Preclinical Visual-Quality Metrics and Halo-Size in Enhanced Monofocal Intraocular Lenses

Presbyopia: Effectiveness of correction strategies

Effect of interocular differences on binocular visual performance after inducing forward scattering

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