scholarly journals Applications of Isolated-Check Visual Evoked Potential in Early Stage of Open-Angle Glaucoma Patients

2018 ◽  
Vol 131 (20) ◽  
pp. 2439-2446 ◽  
Author(s):  
Xiang Fan ◽  
Ling-Ling Wu ◽  
Xia Di ◽  
Tong Ding ◽  
Ai-Hua Ding
Keyword(s):  
Visual Evoked Potential ◽  
Evoked Potential ◽  
Early Stage ◽  
Open Angle Glaucoma ◽  
Open Angle ◽  
Visual Evoked

Visual evoked potentials (VEP) studies in primary open glaucoma

2021 ◽  
Vol 19 (3) ◽  
pp. 28-31
Author(s):  
Bhagya V ◽  
Keyword(s):  
Optic Nerve ◽  
Visual Evoked Potential ◽  
Evoked Potential ◽  
Primary Open Angle Glaucoma ◽  
Open Angle Glaucoma ◽  
Visual Pathway ◽  
Nerve Damage ◽  
Open Angle ◽  
Optic Nerve Damage ◽  
Visual Evoked

Background: With increasing prevalance of primary open angle glaucoma and optic nerve damage as a consequence of this, there is a need for early diagnosis and prevention of optic nerve damage. VEP, the potential recorded from the occipital region in response to the visual stimuli can be used for early detection of the primary open angle glaucoma. Visual evoked potential (VEP) is a non invasive method to assess the visual pathway. The present study was done to evaluate the impact of primary open angle glaucoma on central nervous system particularly, visual pathway. Methods: 30 primary open angle glaucoma patients attending outpatient department of ophthalmology department, SS hospital, Davanagere and 30 age matched controls selected randomly from general population were subjected to Visual evoked potential. Parameters for VEP such as latencies of waves N70, P100, and N155 peak-to-peak amplitudes of waves N70-P100 and P100-N155 were assessed and analyzed by using unpaired student-T test for comparison between cases and controls. Results: The present study observed that the there was a statistically significant increase in P100 latency in cases compared to the controls. And also there was a statistically significant decrease in N70 and P100 amplitude in cases compared to the controls. Conclusion: The present study correlates with earlier findings that visual pathway gets involved in primary open angle glaucoma even before the development of neuropathy which can be detected using VEP. Meticulous follow-up is a must to prevent the complications of primary open angle glaucoma, so that further damage can be prevented.

Accuracy of isolated-check visual evoked potential technique for diagnosing primary open-angle glaucoma

2017 ◽  
Vol 135 (2) ◽  
pp. 107-119 ◽  
Author(s):  
Li Juan Xu ◽  
Liang Zhang ◽  
Sha Ling Li ◽  
Vance Zemon ◽  
Gianni Virgili ◽  
...  
Keyword(s):  
Visual Evoked Potential ◽  
Evoked Potential ◽  
Primary Open Angle Glaucoma ◽  
Open Angle Glaucoma ◽  
Open Angle ◽  
Visual Evoked

scholarly journals Applications of the isolated-check visual evoked potential in primary open angle glaucoma with or without high myopia

2021 ◽  
Vol 14 (5) ◽  
pp. 704-713
Author(s):  
Xia Wang ◽  
◽  
Ya-Hui Wei ◽  
Yuan Fang ◽  
Tian Tian ◽  
...  
Keyword(s):  
High Myopia ◽  
Diagnostic Performance ◽  
Visual Evoked Potential ◽  
Evoked Potential ◽  
Primary Open Angle Glaucoma ◽  
Open Angle Glaucoma ◽  
Signal To Noise Ratio ◽  
Characteristic Curve ◽  
Open Angle ◽  
Visual Evoked

AIM: To explore the diagnostic performance of isolated-check visual evoked potential (icVEP) for primary open angle glaucoma (POAG) in both highly myopic and non-highly myopic populations and compare it with those of optical coherence tomography (OCT) and Heidelberg retinal tomography (HRT) parameters. METHODS: A total of 126 participants were recruited, including 31 highly myopic participants with POAG (HM-POAG), 36 non-highly myopic participants with POAG (NHM-POAG), 25 highly myopic participants without POAG (HM) and 34 controls without high myopia (Normal). All the participants underwent a complete ophthalmic examination. The signal-to-noise ratio (SNR) was used to assess the icVEP. Both qualitative and quantitative diagnostic performances of OCT, HRT and the icVEP were analyzed and compared. RESULTS: Based on the criterion of SNR≤1, the diagnostic performance of the icVEP in highly myopic subjects [area under the receiver operating characteristic curve (AUC)=0.862] was better than that in non-highly myopic subjects (AUC=0.789), and the SNR had fairly good specificity. In distinguishing the HM-POAG and HM groups, the AUC of the SNR was not different from those of the OCT and HRT parameters (P>0.05) in either the qualitative or quantitative comparison. In the qualitative analysis, the icVEP showed good consistency with damage to the central 10° of the visual field (kappa=0.695-0.747, P<0.001). CONCLUSION: The icVEP has the potential to discriminate individuals with and without POAG, especially in populations with high myopia.

scholarly journals Pattern Visual Evoked Potential (VEP) is Unaffected in the Early Stage of Mild Cognitive Impairment

2017 ◽  
Vol 15 (1) ◽  
pp. 87-96 ◽  
Author(s):  
Lau Chean Ling ◽  
Norhani Mohidin ◽  
Azzatul Ainur Mohd Kamal ◽  
Zainora Mohammed ◽  
Bariah Mohd Ali
Keyword(s):  
Cognitive Impairment ◽  
Mild Cognitive Impairment ◽  
Visual Evoked Potential ◽  
Evoked Potential ◽  
Early Stage ◽  
Pattern Visual Evoked Potential ◽  
Visual Evoked

Olfactory Modulation of Steady- State Visual Evoked Potential Topography in Comparison with Differences in Odor Sensitivity

2002 ◽  
Vol 16 (2) ◽  
pp. 71-81 ◽  
Author(s):  
Caroline M. Owen ◽  
John Patterson ◽  
Richard B. Silberstein
Keyword(s):  
Steady State ◽  
Visual Evoked Potential ◽  
Evoked Potential ◽  
Behavioral Responses ◽  
Simultaneous Recording ◽  
Odor Concentration ◽  
Odor Detection ◽  
Detection Response ◽  
Response Groups ◽  
Visual Evoked

Summary Research was undertaken to determine whether olfactory stimulation can alter steady-state visual evoked potential (SSVEP) topography. Odor-air and air-only stimuli were used to determine whether the SSVEP would be altered when odor was present. Comparisons were also made of the topographic activation associated with air and odor stimulation, with the view toward determining whether the revealed topographic activity would differentiate levels of olfactory sensitivity by clearly identifying supra- and subthreshold odor responses. Using a continuous respiration olfactometer (CRO) to precisely deliver an odor or air stimulus synchronously with the natural respiration, air or odor (n-butanol) was randomly delivered into the inspiratory airstream during the simultaneous recording of SSVEPs and subjective behavioral responses. Subjects were placed in groups based on subjective odor detection response: “yes” and “no” detection groups. In comparison to air, SSVEP topography revealed cortical changes in response to odor stimulation for both response groups, with topographic changes evident for those unable to perceive the odor, showing the presence of a subconscious physiological odor detection response. Differences in regional SSVEP topography were shown for those who reported smelling the odor compared with those who remained unaware of the odor. These changes revealed olfactory modulation of SSVEP topography related to odor awareness and sensitivity and therefore odor concentration relative to thresholds.

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