A Comparison of Different Vep Methods for the Assessment of Binocular Vision

Jacobsson, P.; Lennerstrand, Gunnar

doi:10.1007/978-94-009-8656-5_35

Cited by 11 publications

(5 citation statements)

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“…Viewing binocularly a monitor with a reversing pattern for approximately 40 s is the only participation needed once the electrodes are in place. Although some children will remain untestable [9], a short duration of the examination seems advantageous for successful testing. As the stimulus conditions may greatly influence the ssVEP response, further research is necessary to optimise e.g.…”

Section: Discussionmentioning

confidence: 99%

“…This can be a consequence of anatomical factors, or due to different stimulus and recording conditions [8,9]. It is not possible to place the electrodes with a constant relation to the visual cortex in the occipital lobe, and differences in this relationship may cause variations in linear components' amplitude and, to a lesser extent, latency.…”

Section: Introductionmentioning

confidence: 96%

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Fourier-analysed Steady-state VEPs in Pre-school Children with and without Normal Binocularity

Johansson

Jakobsson

2006

Doc Ophthalmol

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Pre-school children aged 4-5 were examined with steady-state VEP in response to a sinusoidal grating pattern with a spatial frequency of 4 c/deg, reversing at rates 5, 10, and 15 Hz. Normal children (n = 10) were compared with subjects lacking stereo perception (n = 6) and with subjects showing significant unilateral amblyopia with visual acuity in the worse eye <0.5 (n = 7). Fast Fourier Transform was used for analysis of the crude steady-state VEP responses. Compared to normals, the subjects lacking stereo perception showed a significantly lower power of the second harmonic in the response evoked by binocular stimulation with gratings reversed at 15 Hz. The amblyopic group showed a significant difference between the dominant and the non-dominant eye regarding the first harmonic power in the responses evoked by gratings reversed at 5 and 10 Hz. These findings are discussed in relation to the magnocellular and parvocellular visual pathways and suggested models for linear and non-linear processing of visual signals.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 96%

Fourier-analysed Steady-state VEPs in Pre-school Children with and without Normal Binocularity

Johansson

Jakobsson

2006

Doc Ophthalmol

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“…This phenomenon was called summation. Later on summation was found with pattern stimuli as well and was considered to be an expression of binocular single vision (Fiorentini and Maffei, 1970;Harter et al, 1973;Lennerstrand, 1978b;Groneberg and Teping, 1981;Jacobson and Lennerstrand, 1981). Retinal rivalry was shown to decrease the VER (Cobb et al, 1967;Lawwill and Biersdorf, 1968;Cobb et al, 1976;Matsuhashi and Oguchi, 1981).…”

Section: Binocular Ver In Normalsmentioning

confidence: 99%

Binocularity in comitant strabismus: II. Objective evaluation with visual evoked responses

Campos

Chiesi

1983

Doc Ophthalmol

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Campos (1982a) reported on his psychophysical studies on the binocularity of patients with comitant strabismus. With binocular visual field techniques, it was possible to show that patients with small-angle eso- and exotropia exhibit a binocular vision, without suppression of the deviated eye. In the present paper visual electrophysiology is used objectively these findings and to provide more insight in the problem. First, the studies on binocularity in normals and strabismics, done by using visual evoked responses (VER) are reviewed. This type of investigation is relatively new and the results of the literature are still conflicting. Then personal results of the authors are reported. It is shown that with VER it is possible to objectively assess the presence of anomalous binocular vision (ABV) sustained by anomalous retinal correspondence (ARC) in small-angle strabismus. In patients with large angle deviations this type of binocularity is absent. A correlation between psychophysical and electrophysiological data is provided. Lastly a simple method is described for differentiating the binocularity of normals from that of Strabismics with ARC. This method is based on the recording of binocular VER with the anteposition in front of the fixing eye of neutral filters of increasing density.

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“…15,16 Swept-parameter visual evoked potential (sVEP) is a rapid and objective test with promising capabilities for overcoming the limitations of subjective testing. Previous studies using both steady-state [17][18][19][20][21][22][23][24] and transient [25][26][27][28][29] VEP have shown significant differences between amblyopic and fellow or normal control eyes with respect to threshold, amplitude, and/or latency. However the optimal stimulus paradigm for differentiating amblyopic from normal eyes has not yet been determined.…”

mentioning

confidence: 99%

Degradation of Swept-Parameter VEP Responses by Neutral Density Filters in Amblyopic and Normal Subjects

Ely

Weinstein

Price

et al. 2014

Invest. Ophthalmol. Vis. Sci.

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Neutral density filtration causes preferential degradation of both threshold and suprathreshold sVEP responses in normal control eyes and fellow eyes of amblyopes, compared to amblyopic eyes. The degradation is stimulus specific and dependent upon whether threshold or suprathreshold responses are measured. Grating responses are more likely to identify suprathreshold abnormalities, while vernier stimuli are more likely to detect threshold abnormalities. These findings may be used to optimize the stimulus parameters and design of future studies utilizing evoked potential techniques in amblyopic subjects.

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A Comparison of Different Vep Methods for the Assessment of Binocular Vision

Cited by 11 publications

References 11 publications

Fourier-analysed Steady-state VEPs in Pre-school Children with and without Normal Binocularity

Fourier-analysed Steady-state VEPs in Pre-school Children with and without Normal Binocularity

Binocularity in comitant strabismus: II. Objective evaluation with visual evoked responses

Degradation of Swept-Parameter VEP Responses by Neutral Density Filters in Amblyopic and Normal Subjects

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