Relative contributions of the two eyes to perceived egocentric visual direction in normal binocular vision

Sridhar, Deepika; Bedell, Harold E.

doi:10.1016/j.visres.2011.02.023

Cited by 10 publications

(16 citation statements)

References 55 publications

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“…Perceived EVD was determined from normal observers’ open-loop pointing responses (Barbeito & Ono, 1979; Bock & Kommerell, 1986; Ono & Weber, 1981; Sridhar & Bedell, 2011; Steinbach & Smith, 1981) to a fixation cross that was presented on the black background of a 120-Hz frame-rate, gamma-corrected Clinton Monochrome Monoray monitor. The stimuli were presented at a physical distance of 50 cm.…”

Section: General Methodsmentioning

confidence: 99%

“…However, subsequent reports indicate that between-eye differences in the weighting of eye-position information occur in some observers (Simpson, 1992; Sridhar & Bedell, 2011). Therefore, in the general case,…”

Section: Introductionmentioning

confidence: 99%

“…Specifically, the perceived direction of a disparate target is weighted more heavily toward the image with less blur (Charnwood, 1949), higher luminance (Charnwood, 1949; Francis & Harwood, 1951; Sridhar & Bedell, 2011), or more contrast (Ding & Sperling, 2007; Mansfield & Legge, 1996; Sridhar & Bedell, 2011), indicating unequal weighting of the retinal information from the two eyes.…”

Section: Introductionmentioning

confidence: 99%

“…However, we reported recently that many individuals exhibit similar quantitative between-eye differences in the relative weighting of the retinal and eye-position information that contribute to perceived EVD (Sridhar & Bedell, 2011), raising the possibility that these two sources of information are not independent.…”

Section: Introductionmentioning

confidence: 99%

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Binocular retinal image differences influence eye-position signals for perceived visual direction

Sridhar

Bedell

2012

Vision Research

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Correctly perceiving the direction of a visible object with respect to one’s self (egocentric visual direction) requires that information about the location of the image on the retina (oculocentric visual direction) be combined with signals about the position of the eyes in the head. The Wells-Hering laws that govern the perception of visual direction and modern restatements of these laws assume implicitly that retinal and eye-position information are independent of one another. By measuring observers’ manual pointing responses to targets in different horizontal locations, we show that retinal and eye-position information are not treated independently in the brain. In particular, decreasing the relative visibility of one eye’s retinal image reduces the strength of the eye-position signal associated with that eye. The results can be accounted for by interactions between eye-specific retinal and eye-position signals at a common neural location.

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Section: General Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Binocular retinal image differences influence eye-position signals for perceived visual direction

Sridhar

Bedell

2012

Vision Research

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“…The hole-in-card method measures sighting dominance, but according to some studies, may play a role in the judgment of visual direction. 20,25,28 The near-point-of-convergence method measures the relative strength in keeping fixation on the target approaching close to the observer. 29,30 Stereopsis is directly related to how the visual cortex processes the interocular image disparity.…”

Section: On Comparison With Previous Studiesmentioning

confidence: 99%

Balanced Eyes See Stereopsis More Quickly, but Not More Finely

Bai

Zhang

et al. 2018

Invest. Ophthalmol. Vis. Sci.

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PURPOSE. To quantify ocular sensory dominance and investigate its relationship to stereopsis. METHOD.A total of 69 subjects participated in the study. Ocular dominance was measured by a continuous flashing technique, with the tested eye viewing a Gabor patch increasing in contrast, and the fellow eye viewing a Mondrian noise decreasing in contrast. In each trial, the log ratio of Mondrian to Gabor's contrasts was recorded as a subject first detected the Gabor. We collected 50 trials for each eye and an interocular difference was analyzed with a rank-sum test. The z-value was used as the ocular dominance index (ODI) to quantify the degree of ocular dominance. A subject with ODI ‡ 2 was categorized as having a clear ocular dominance, and a subject with ODI < 2 was considered as having balanced eyes (unclear dominance). The stereoacuity was measured with random dot patterns with durations varying from 50 to 1000 ms. The best achievable stereoacuity (D min ) and the integration time needed to acquire that (T min ) were calculated. RESULTS.A total of 30 subjects had balanced eyes and 39 had clear ocular dominance. T min was significantly longer in subjects with clear ocular dominance than in subjects with balanced eyes (180.18 vs. 121.17 ms, P < 0.01). T min was positively correlated with ODI (P < 0.01). However, D min in subjects with clear dominance was not different from that in subjects with balanced eyes (40.60 vs. 35.73 arcsec, P ¼ 0.18).CONCLUSIONS. Ocular dominance is not associated with how fine the stereoacuity is, but rather how quickly the best stereoacuity is acquired.

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Elucidation of the more myopic eye in anisometropia: the interplay of laterality, ocular dominance, and anisometropic magnitude

Jiang

Chen

Bai

et al. 2019

Sci Rep

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This study reveals how, in a myopic anisometrope, the odds of an eye being more myopic are related to laterality, ocular dominance, and magnitude of anisometropia. In 193 subjects, objective refraction was performed with cycloplegia. Sighting, motor, and sensory dominance were determined with the hole-in-the-card test, convergence near-point test, continuous flashing technique, respectively. Multiple logistic regression was used for probability analysis. Seventy percent of the subjects had a right eye that was more myopic, while 30% of them had a more myopic left eye. When the right eye was the sensory dominant eye, the probability of the right eye being more myopic increased to 80% if the anisometropia was less than 3.0 D, and decreased below 70% if anisometropia was beyond 3.0 D. When the left eye was the sensory dominant eye, the probability of the left eye being more myopic increased to above 40% if the anisometropia was less than 4.0 D and decreased below 30% if the anisometropia was beyond 4.0 D. Therefore, between the two eyes of anisometropes, laterality tilts the chance of being more myopic to the right. Being the sensory dominant eye increases an eye’s probability of being more myopic by another 10% if the magnitude of anisometropia is moderate.

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Relative contributions of the two eyes to perceived egocentric visual direction in normal binocular vision

Cited by 10 publications

References 55 publications

Binocular retinal image differences influence eye-position signals for perceived visual direction

Binocular retinal image differences influence eye-position signals for perceived visual direction

Balanced Eyes See Stereopsis More Quickly, but Not More Finely

Elucidation of the more myopic eye in anisometropia: the interplay of laterality, ocular dominance, and anisometropic magnitude

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