Gender-based normative values for pattern-reversal and flash visually evoked potentials under binocular and monocular stimulation in healthy adults

Dotto, Patrícia de Freitas; Berezovsky, Adriana; Sacai, Paula Yuri; Rocha, Daniel; Salomão, Solange Rios

doi:10.1007/s10633-017-9594-x

Cited by 19 publications

(11 citation statements)

References 48 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Correlations between conditions for these measures, however, were even higher than those obtained for the peak time measures. The amplitude and peak time values reported here in Table 1 for the 1-min condition match closely the corresponding values collected under similar ISCEV-standard conditions (Odom et al, 2016) in a recent study (de Freitas Dotto, Berezovsky, Sacai, Rocha, & Salomão, 2017). An example of a tVEP-CR waveform obtained under the short-duration condition is depicted in Figure 8a.…”

Section: Waveform Analysissupporting

confidence: 84%

Quantification and statistical analysis of the transient visual evoked potential to a contrast‐reversing pattern: A frequency‐domain approach

Zemon

Gordon

2018

Eur J of Neuroscience

View full text Add to dashboard Cite

Visual function is often assessed by recording transient visual evoked potentials to contrast reversal of spatial patterns (tVEP-CR). This technique relies on measurements of amplitudes and peak times of a few points in the time-domain waveform, which require subjective selection of appropriate time points in a possibly noisy waveform and ignores much of the informational content in the response. Here, we introduce a set of frequency-domain measures that capture the full content of the response. Magnitude-squared coherence is used to determine the significance and reliability of magnitude measures; estimates of time delay are based on frequency-domain phase measures. In Study 1, extensive testing of a small number of observers revealed response details, and in Study 2, testing of a larger sample verified the novel frequency-domain measures and demonstrated the validity of a short-duration technique to produce reliable tVEP-CRs. In addition, Study 2 revealed adaptation effects present under prolonged stimulation conditions. Principal component analyses provided evidence for six distinct frequency mechanisms, and comparisons with time-domain measures indicated that power in high-frequency bands may be used as objective measures of excitatory input to visual cortex. A middle-frequency band captures the major peaks in the tVEP-CR waveform, and its power is highly correlated with the standard peak-to-trough amplitude measure. These novel frequency-domain indices may serve as more precise and powerful tools to assess visual function in healthy and diseased states.

show abstract

Section: Waveform Analysissupporting

confidence: 84%

Quantification and statistical analysis of the transient visual evoked potential to a contrast‐reversing pattern: A frequency‐domain approach

Zemon

Gordon

2018

Eur J of Neuroscience

View full text Add to dashboard Cite

show abstract

“…Gender differences in VEP peak times and amplitudes have been reported in humans . In our study, the total number of males was too small (nine males, evenly distributed across the evaluated age span from 44 hours to 28 years) to make meaningful comparisons between genders and to assess gender effects in the equine FVEP.…”

Section: Discussioncontrasting

confidence: 61%

Age‐associated changes in the equine flash visual evoked potential

Ström

Michanek²,

Ekesten

2018

Veterinary Ophthalmology

View full text Add to dashboard Cite

The overall equine FVEP waveform was similar across the normal life-span of the horse in our cross-sectional study. We found that the visual system of the foal seems to be well developed already at birth. Furthermore, our results showed a decrease in amplitudes and increase in some peak times with increasing age. We recommend that age-matched controls should be used when evaluating foals and young horses in clinical practice, whereas horses over the age of three years can be compared to other adult horses.

show abstract

“…In our case, the latency and amplitude of P2-wave in both eyes are comparable. In addition, there parameters are all within normative ranges [28].…”

Section: Discussionmentioning

confidence: 97%

Diagnosis of keratoconus in a young male after the hint of electrophysiological test: A Case Report and Review of the Literature

Yan¹,

Wang²,

Chen³

et al. 2019

Preprint

View full text Add to dashboard Cite

Background: Keratoconus (KCN) is a bilateral and usually asymmetrical disease in which the ectatic cornea becomes conical. Diagnosis of unimproved visual acuity (VA) as KCN might sometimes be missed out due to lack of consideration. However, combination of the electrophysiology test and other common ophthalmological examinations could help to locate the lesion for the unimproved VA and realize the possibility of the existence of KCN, which could be diagnosed via corneal topography. The purpose of this report is to describe the diagnosis process of a case of KCN after the hint of lesion location by electrophysiological tests. Case presentation: A 23-year-old young male presented to our ophthalmology clinic complaining of decreased visual acuity in the left eye for 5 months. Clinical evaluation showed best corrected visual acuity of 1.0 OD, and 0.06 OS. The dilated fundus examination revealed no specific abnormality. Spectral-domain optical coherence tomography (SD-OCT) of macular revealed no obvious change on macular and the thickness of peripapillary nerve fiber layer on both eyes. No leakage of fluorecein was found under Fluorescein angiogram (FFA) of both eyes. Indocyanine green angiography (ICGA) did not showed abnormality. The full-field electroretinogram (ffERG) revealed no obvious changes of amplitudes in all responses. Pattern visual evoked potentials (PVEP) detected a reduced amplitude and delayed phase in P100-wave in both eyes. The amplitude and latency of P2-wave in Flash VEP (FVEP) were comparable in both eyes and were within normative ranges. Corneal topography was finally performed and KCN was diagnosed with the presence of asymmetrical bowtie pattern in both eyes, which was worse in the OS. Conclusions: The hint of lesion location by electrophysiological studies (ffERG, PVEP and FVEP) could be of favor to diagnose the conditions with unimproved VA, such as KCN. Consideration of KCN should be suspected in patients with unimproved VA and significant irregular stigmatism, while no obvious lesion exists in other parts of the eye.

show abstract

Gender-based normative values for pattern-reversal and flash visually evoked potentials under binocular and monocular stimulation in healthy adults

Cited by 19 publications

References 48 publications

Quantification and statistical analysis of the transient visual evoked potential to a contrast‐reversing pattern: A frequency‐domain approach

Quantification and statistical analysis of the transient visual evoked potential to a contrast‐reversing pattern: A frequency‐domain approach

Age‐associated changes in the equine flash visual evoked potential

Diagnosis of keratoconus in a young male after the hint of electrophysiological test: A Case Report and Review of the Literature

Contact Info

Product

Resources

About