Troxler effect with dichoptic stimulus presentations: Evidence for binocular inhibitory summation and interocular suppression

Lou, Liang

doi:10.1016/j.visres.2008.04.001

Cited by 7 publications

(5 citation statements)

References 30 publications

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“…Although the blink reflex is suppressed by anesthetics, it is not completely eliminated, as required for the scans. Furthermore, the Troxler effect, which causes a stimulus to disappear during prolonged viewing 38 and could result in unpredictable eye movements, would not have been eliminated by topical anesthetic. A system was therefore developed to allow the scan to be paused as required for blinking and refixation.…”

Section: Mri Protocol Developmentmentioning

confidence: 99%

Three-Dimensional Magnetic Resonance Imaging of the Phakic Crystalline Lens during Accommodation

Sheppard

Evans

Singh

et al. 2011

Invest. Ophthalmol. Vis. Sci.

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During accommodation, mean crystalline lens thickness increased (F = 33.39, P < 0.001), whereas lens equatorial diameter (F = 24.00, P < 0.001) and surface radii both decreased (anterior surface, F = 21.78, P < 0.001; posterior surface, F = 13.81, P < 0.001). Over the same stimulus range, mean crystalline lens surface area decreased (F = 7.04, P < 0.005) with a corresponding increase in lens volume (F = 6.06, P = 0.005). These biometric changes represent a 1.82% decrease and 2.30% increase in crystalline lens surface area and volume, respectively. CONCLUSIONS; The results indicate that the capsular bag undergoes elastic deformation during accommodation, causing reduced surface area, and the observed volumetric changes oppose the theory that the lens is incompressible.

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Section: Mri Protocol Developmentmentioning

confidence: 99%

Three-Dimensional Magnetic Resonance Imaging of the Phakic Crystalline Lens during Accommodation

Sheppard

Evans

Singh

et al. 2011

Invest. Ophthalmol. Vis. Sci.

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“…Nine participants were right eye dominant, according to the Miles test. 15,24 Hadassah Hebrew University Medical Center Ethics Committee approved the experimental procedure based on the tenets of the Declaration of Helsinki; written informed consent was obtained from all subjects after explanation of the nature and possible consequences of the study.…”

Section: Methods Subjectsmentioning

confidence: 99%

How Ocular Dominance and Binocularity Are Reflected by the Population Receptive Field Properties

Best

Raz

Dumoulin

et al. 2018

Invest. Ophthalmol. Vis. Sci.

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PURPOSE. The neural substrate of binocularity and sighting ocular dominance in humans is not clear. By utilizing the population receptive field (pRF) modeling technique, we explored whether these phenomena are associated with amplitude and pRF size differences. METHODS. The visual field maps of 13 subjects were scanned (3-T Skyra) while viewing drifting bar stimuli. Both eyes (binocular condition), the dominant eye and the nondominant eye (two monocular conditions) were stimulated in separate sessions. For each condition, pRF size and amplitude were assessed. Binocular summation ratios were calculated by dividing binocular by mean monocular values (amplitude and pRF size). RESULTS. No differences in pRF size were seen between the viewing conditions within each region, that is, either between binocular and monocular or between dominant and nondominant viewing conditions. Binocular amplitudes were higher than the monocular amplitudes, but similar among the dominant and nondominant eyes. Binocular summation ratios derived from amplitudes were significantly higher than one (~1.2), while those ratios derived from pRF size were not. These effects were found in all studied areas along the visual hierarchy, starting in V1. CONCLUSIONS. Neither the amplitude nor the pRF size show intereye difference and therefore cannot explain the different roles of the dominant and the nondominant eyes. Binocular, as compared to monocular vision, resulted in higher amplitudes, while receptive fields' sizes were similar, suggesting increased binocular response intensity as the basis for the binocular summation phenomenon. Our results could be applicable in imaging studies of monocular disease and studies that deal with nondisparity binocularity effects.

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“…It often seems as scattered small particles and flare and it causes a scattered beam light in blue color in anterior chamber. 40…”

Section: Tyndall Phenomenonmentioning

confidence: 99%

Ophthalmological phenomena

Turgut¹

2018

AOVS

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The term ''phenomenon'' can sometimes be miscalled equally to the terms ''sign or reflex''. However, terms ''syndrome and disease'' are not often confused with the phenomenon. Reflex is defined as '' an involuntary physical reaction or automatic response from the nerve impulse to a stimulus. 5-7 On the other hand, the term in medicine ''sign'' is any abnormal, observable evidence or physical phenomenon which often indicates dysfunction or disease. It is usually detected by the physician even if the patient cannot observe and experience it. 8,9 Regarding phenomena in ophthalmology, we fund just a publication by Sharma et al., 10 in the web. Here, following the search of the term in major academical and scientific databases and indexes, we tried to present in alphabetical order, some common phenomena in ophthalmology. Some of these are actual phenomena that we have known already before but are called differently.

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Troxler effect with dichoptic stimulus presentations: Evidence for binocular inhibitory summation and interocular suppression

Cited by 7 publications

References 30 publications

Three-Dimensional Magnetic Resonance Imaging of the Phakic Crystalline Lens during Accommodation

Three-Dimensional Magnetic Resonance Imaging of the Phakic Crystalline Lens during Accommodation

How Ocular Dominance and Binocularity Are Reflected by the Population Receptive Field Properties

Ophthalmological phenomena

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