Visual function assessed by visually evoked potentials in adults with orbital and other primary intracranial tumors

2020 ◽  
pp. 112067212092564
Author(s):  
Patrícia de Freitas Dotto ◽  
Adriana Berezovsky ◽  
Paula Yuri Sacai ◽  
Daniel Martins Rocha ◽  
Arthur Gustavo Fernandes ◽  
...  
Keyword(s):  
Visual Acuity ◽  
Evoked Potentials ◽  
Visual Function ◽  
Evoked Potential ◽  
Adult Patients ◽  
Low Grade ◽  
Pattern Reversal ◽  
Visually Evoked Potentials ◽  
Primary Tumors ◽  
Visually Evoked Potential

Purpose: The purpose of this study was to assess visual function by visually evoked potentials in adults with orbital and other primary brain tumors affecting the optic pathway. Methods: In this retrospective case–control series, patients with orbital (intraconal and extraconal) or midline/chiasmatic tumors were included. Visually evoked potentials using pattern-reversal visually evoked potential and flash visually evoked potential stimuli were performed according to the international standards. Outcome measures were visually evoked potential parameters of amplitude (µV) and peak times (ms) measured both for the P100 component (pattern-reversal visually evoked potentials) and the N2P2 complex (flash visually evoked potential). Individual results were also compared with gender-based normative values. Results: A group of 21 adult patients (17 females) and age- and sex-matched controls were evaluated. Tumor location was intraconal (6 meningiomas, 3 hemangiomas, 1 glioma), extraconal (6 meningiomas), and midline (3 pituitary adenomas, 2 hypothalamic/chiasmatic low-grade gliomas). Abnormal fundus (76%), abnormal pupillary reflexes (71%), reduced visual acuity (62%), strabismus (48%), and proptosis (38%) were present. Visually evoked potential abnormalities were found in at least one eye of all cases. Affected eyes had significantly reduced amplitudes and prolonged peak times for pattern-reversal visually evoked potentials ( p < .001) and significantly reduced amplitudes for flash visually evoked potential ( p < .001). In unilateral orbital tumors, abnormally prolonged pattern-reversal visually evoked potential peak times were also detected in some contralateral eyes ( n = 6/16). Conclusion: Visually evoked potential abnormalities were found in all adult patients with orbital and other intracranial primary tumors, even in eyes with normal exam and good visual acuity. Visually evoked potential can be used as a non-invasive ancillary test to characterize and monitor visual function in subjects with these neoplastic lesions.

Visual function assessed by visually evoked potentials in optic pathway low-grade gliomas with and without neurofibromatosis type 1

2018 ◽  
Vol 136 (3) ◽  
pp. 177-189 ◽  
Author(s):  
Patrícia de Freitas Dotto ◽  
Adriana Berezovsky ◽  
Andrea Maria Cappellano ◽  
Nasjla Saba da Silva ◽  
Paula Yuri Sacai ◽  
...  
Keyword(s):  
Evoked Potentials ◽  
Neurofibromatosis Type 1 ◽  
Visual Function ◽  
Neurofibromatosis Type ◽  
Low Grade ◽  
Optic Pathway ◽  
Visually Evoked Potentials ◽  
Low Grade Gliomas

Visual Evoked potential signal processing and analysis for normal and galucomic eyes

2015 ◽  
Vol 8 (2) ◽  
pp. 2106-2121
Author(s):  
Hamed Ibrahem Abdelkader ◽  
Mona Abdelkader ◽  
Mohammed Kabeel ◽  
Malak Alya
Keyword(s):  
Evoked Potentials ◽  
Visual Evoked Potential ◽  
Evoked Potential ◽  
Optic Tract ◽  
Pattern Reversal ◽  
Blue Color ◽  
Check Size ◽  
Retinal Stimulation ◽  
Normal Individuals ◽  
Visual Evoked

Visual evoked potentials (VEPS) are obtained from optic tract by recording the evoked potentials generated by retinal stimulation. The flash VEP (FVEP) is used less frequently than pattern reversal VEP (PRVEP) because; it shows great variation in both latency and amplitude. The present study was undertaken to evaluate the effect of change of wavelength of flash and change of check size on the parameters of visual evoked potential (amplitude and latency) in normal individuals and glaucoma patients. The group of healthy subjects in the age of 20-45 years while the group of glaucoma subjects where  in the age of 25-50 years.  The two groups were exposed to flash VEP with white light and blue color and they also were exposed to checks subtending a visual angles of 15, 30,60 and 120 minutes of arc. The measured data were statistically analyzed and summarized by histograms. The interindividual and intraindividual in latencies and amplitudes for FVEP were assessed using  the coefficient of variation (COV). In conclusion, monochromatic flash VEP was preferred than white as there were minimal inter and intra individual variation of latencies and amplitudes. The most preferred check size in PRVEP was 120' for  the two groups.  

Asymmetry of visual function in migraine with aura: Correlation with lateralisation of headache and aura

Cephalalgia ◽  
2010 ◽  
Vol 31 (2) ◽  
pp. 213-221 ◽  
Author(s):  
Nofal M Khalil ◽  
Alessia Nicotra ◽  
Arnold J Wilkins
Keyword(s):  
Evoked Potentials ◽  
Migraine With Aura ◽  
Visual Evoked Potentials ◽  
Visual Function ◽  
Group Differences ◽  
Neural Function ◽  
Pattern Reversal ◽  
Cortical Level ◽  
Visual Phenomena ◽  
Age Range

Background: Asymmetry of visual phenomena and headache is an important feature of migraine with aura. Methods: This asymmetry was explored by assessment of visual illusions, hemifield spatial contrast detection (HCD) and hemifield pattern reversal visual evoked potentials (HVEPs) in 47 migraineurs with aura (MA), who were not taking prophylactic medications, and 62 controls with the same age range (16–59). Results: Illusions were greater and HCD was poorer in MA than in controls. There were no group differences with respect to P100 amplitude. The longer the duration of migraine the poorer the HCD. When the aura was consistently unilateral it was associated with greater illusions, reduced HCD and reduced hemifield P100 amplitude. These findings were not related to the side of headache. Conclusion: The lateralised changes suggest that the visual dysfunction occurs at a cortical level, and the correlation with the side of the aura suggests that dysfunction is most likely to occur in an area of preexisting anomaly of neural function.

scholarly journals Grating visual acuity impairment assessed by sweep visually evoked potentials in children with optic pathway tumors unable to perform optotype acuity tests

2021 ◽  
Vol 84 (2) ◽  
Author(s):  
Patrícia de Freitas Dotto ◽  
Adriana Berezovsky ◽  
Andrea Maria Cappellano ◽  
Nasjla Saba da Silva ◽  
Paula Yuri Sacai ◽  
...  
Keyword(s):  
Visual Acuity ◽  
Evoked Potentials ◽  
Optic Pathway ◽  
Visually Evoked Potentials

scholarly journals Reliable detection of low visual acuity in mice with pattern visually evoked potentials

2018 ◽  
Vol 8 (1) ◽  
Author(s):  
Naoyuki Tokashiki ◽  
Koji M Nishiguchi ◽  
Kosuke Fujita ◽  
Kota Sato ◽  
Yurika Nakagawa ◽  
...  
Keyword(s):  
Visual Acuity ◽  
Evoked Potentials ◽  
Visually Evoked Potentials ◽  
Reliable Detection
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