Clinical Trials About "Visual epidural field potentials possess high functional specificity" RSS

03:28 EDT 20th September 2019 | BioPortfolio

We list hundreds of Clinical Trials about "Visual epidural field potentials possess high functional specificity" on BioPortfolio. We draw our references from global clinical trials data listed on and refresh our database daily.

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Showing "Visual epidural field potentials possess high functional specificity" Clinical Trials 1–25 of 24,000+


Frequency Doubling Technology (FDT) Mobile Visual Field Testing

This is a single center, prospective study to evaluate the efficacy and reproducibility of frequency doubling technology (FDT)-based visual field devices compared to conventional Humphrey Visual Field (HVF) perimetry. The investigators plan to enroll 500 patients in this study.

How Well Does the Data Obtained From Heidelberg Edge Perimeter Visual Field Compare to Standard Octopus Visual Field

The purpose of this study is to compare standard automated perimetry (SAP) using the Heidelberg Edge Perimeter (HEP) with the Octopus Visual Field (OVF) analyzer and determine test-retest reliability of both parameters in detecting glaucomatous visual field losses.

Feasibility of Visual Field Testing With a Virtual Reality Headset

This study aim to determine the feasibility of using a virtual reality (VR) headset (HTC Vive) to test the visual field. The VR headset test will be compared to a conventional visual field test, using the Humphrey Field Analyzer. The investigators will include 10 healthy patients without visual field defect, 10 patients with early glaucomatous visual field defect, and 10 patients with advanced visual field defect. Each patient will perform the conventional test twice and the VR...

Visual Restoration for Hemianopia

The purpose of this research is to assess the efficacy of a visual training task on reducing the size of a visual field deficit caused by brain damage in adults, and its ability to improve visual functions in this patient population.

Variability in Perimetry Study

Improved Assessment of Visual Field Change is a trial aimed at investigating mechanisms of visual field testing variability. We have found using larger stimulus size substantially lowers short-term variability. In this study, we will determine if larger stimuli detect visual field change at an earlier time. We are also developing a statistical model that accounts for correlations of neighboring test locations.

Diagnostic Performance of Smart Supra Perimetry (The DPSSP Study)

Early glaucomatous visual field changes can be missed with the routinely used Standard Automated Perimetry (SAP) and the 24-2 test pattern due to limited sampling of the central 10 degrees. While this shortcoming can be overcome with the addition of a 10-2 test, performing both tests places extra demand on the perimetric services (doubling test times) and patients. Smart Supra Perimetry (SSP) uses a new faster algorithm that can complete both 24-2 and 10-2 test patterns in a s...

Are There Changes in the Nerve Fiber Layer (NFL) After Lowering of Eye Pressure?

The aim of this study was to evaluate structural and functional improvement following intraocular pressure (IOP) reductions in patients with glaucoma using Spectral Domain Optical Coherence Tomography (SD-OCT), Visual Field (VF) testing, and Visual Evoked Potential (VEP).

Repetitive Transcranial Magnetic Stimulation for Post-Stroke Visual Field Defects

Visual field defects (VFD) usually do not show improvement beyond 12 weeks from onset. Plasticity occurs in areas of residual vision (ARV) at the visual field which are the functional counterpart of partially damaged brain regions at the areas around brain lesion. Few treatment options are currently available for post-stroke VFD. In this pilot study, the effect of repetitive transcranial magnetic stimulation (rTMS) applied to these areas on VFD in patients with cortical infarct...

Restoration of Vision After Stroke

Occipital stroke is associated with homonymous visual field defects (occurring on one side of the visual field). Despite spontaneous recovery, some degree of defect is often permanent. Currently, no treatment exists for such visual field defects.The purpose of this study is to test the efficacy of a type of electrical brain stimulation method, transcranial alternating current stimulation, in reducing these type of visual field defects in their chronic stage.

Evaluation of the Visual Field on the Ground

Retinopathy pigmentosa (which affects about 40,000 patients in France) leads to destruction of the peripheral retina. This condition, often familial, frequently affects young patients. Visual acuity is excellent for a long time, the disease affecting the central macular region only belatedly. On the other hand, the visual field is very quickly narrowed to a central or paracentral zone. For the patient, knowing the limits of his visual field and learning to adapt is necessary ...

Diagnostic Efficacy of CNN in Differentiation of Visual Field

Glaucoma is currently the leading cause of irreversible blindness in the world. The multi-center study is designed to evaluate the efficacy of the convolutional neural network based algorithm in differentiation of glaucomatous from non-glaucomatous visual field, and to assess its utility in real world.

Non-inferiority Study for Visual Field Measurements Using a Virtual Reality Device

It is hypothesized that performing VF measurements with a Virtual Reality headset using similar testing strategies as implemented in conventional perimeters, allow for a non-inferior quality in VF acquisitions. The results of this study will show if valid measurements of such devices in human subjects can be obtained. The primary endpoint of this study is the non-inferiority estimation quality of participant's mean defect (MD) measured in decibel (dB) between the head-mounted ...

Clinical Study of Structural and Functional Evaluation of the Visual Pathway

Sellar area tumors such as pituitary adenoma, craniopharyngioma and meningioma, etc, commonly lead to visual impairment symptoms. Patients suffer from a loss of visual acuity (VA) and visual field defects (VF) due to a local compression on the optic chiasma by the tumor. In the management of these patients, it is an important goal to evaluate their visual function throughout the treatment, so as to predict the outcome of the visual function . Since the visual pathway contains ...

High-Field MRI Characterization of Wrist and Hand Cartilage Abnormalities in Inflammatory and Chronic Rheumatisms

The present project aims at evaluating the diagnostic potential of high-field MRI (3 Teslas) for joint disease. At this field, given that isotropic image resolution of 400 microns can be obtained, one could expect an early detection of joint abnormalities. The additional aim of this project will be to develop a quantitative analyse of the corresponding high-resolution images.

Evaluation of the Electroretinogram Pattern (Diopsys® NOVA System) for the Early Diagnosis of Glaucoma

Glaucoma is a common and potentially blinding disease. It is characterized by an optic nerve damage, a visual field defect and elevated intraocular pressure (IOP). The loss of retinal nerve fibers is accompanied by functional impairment in the territories corresponding to deficits of the visual field. However, this structure-function relationship is not always found initially. These discrepancies are mainly chronological: the structural damage preceding the functional impairme...

Nutritional Supplements and Performance During Visual Field Testing (B3 Vitamin)

This study seeks to test whether these over-the-counter nutritional supplements have an impact on patients' performance during visual field testing.

Restoration vs. Compensation in Neurovisual Rehabilitation of Visual Field Defects

Visual field defects (VFD) are a frequent effect of cerebral lesions especially after posterior cerebral artery stroke. The present study was conducted to compare effects of vision restoration training (VRT) and compensation training (Visual Exploration Training, VET) on visual field performance.

Visual Field Defect Estimation Using Sequentially Optimized Reconstruction Strategy on Healthy and Glaucoma Subjects

Perimetry is a well-established method that is used to measure the visual field functions of humans. Commercially available products, such as the OCTOPUS 900 (Haag-Streit AG, Koeniz, Switzerland), are commonly used for assessing the visual field. Such devices are of critical value for patients suffering of glaucoma and neuro-ophthalmic conditions. The operating principle is to sequentially present light stimuli of different intensity at different locations within the visual fie...

Efficacy and Safety of Electric Stimulation-guided Epidural Anesthesia for Cesarean Section

Forty pregnant women (36 to 41 weeks gestation) will randomly allocate to two groups. Groups will be defined based on the method used to identify the epidural space for epidural anesthesia: the loss of resistance group (n=20) and the epidural electric stimulation group (n=20). Pain during the cesarean section will be assessed using a numerical visual analog scale and maternal satisfaction by a post-partum interview. The success rate of epidural anesthesia, maternal satisfaction...

The Stroke Vision App: A Screening Tool for Visual Stroke

Visual impairment can affect up to 70% of stroke survivors, but many do not have their vision adequately assessed in hospital. An unidentified visual defect can cause significant problems for recovery and quality of life. The Stroke Vision app (an application currently scaled for a 10" Android tablet) has been developed to act as a screening tool for visual problems in stroke survivors; to help identify visual problems earlier and thereby improve rehabilitation outcomes. The ap...

A Comparison of the Effect of Dorzolamide and Timolol on Optic Disk Blood Flow in Patients With Open Angle Glaucoma

Glaucoma is one of the most common causes of blindness in the industrialized nations. For a long time glaucoma has been defined as a disease in which high intraocular pressure (IOP) leads to irreversible optic disk damage and concommitant visual field loss. However, recent investigations show that IOP is not necessarily an adequate measure of clinical severity or a predictor of clinical progression: about 20% of all eyes with high IOP do not develop visual field loss and some p...

Functional Scaffold Transplantation Combined With Epidural Electrical Stimulation for Spinal Cord Injury Repair

The study is designed to assess the role of functional neural regeneration collagen scaffold transplantation combined with epidural electrical stimulation in spinal cord injury patients.

Is There a Relation Between Unilateral Epidural Block and Repeated Epidural Anesthesia?

epidural block is today the most common method of pain relief during labor. With increased use of epidural analgesia, many women are found in the second or third pregnancy and require repeated epidural analgesia. But there was a higher incidence of unilateral blockade among women receiving their repeated epidural which causes patient unsatisfaction. Objectives: Examination of the performance and outcome of women receiving their first versus repeated epidural block. Pati...

Effect of Levodopa on Human Multifocal Electroretinogram

It is known that dopamine is a functional neuromodulator at several levels of the visual system. Dopamine seems to be involved in the organization of the ganglion cell and the bipolar cell receptive fields and modulation of physiological activity of photoreceptors. There is evidence for the functional significance of dopaminergic modulation of visual sensitivity in humans which confirms the hypothesis that dopamine plays an important role in retinal light adaptation as well as...

Audiovisual Assessment After Dural Puncture During Epidural Placement in Obstetric Patients

The study involves assessment of hearing and visual complications along with headache after accidental dural puncture in patients receiving epidurals. Hearing loss will be assessed by clinical examination and audiometry testing, while visual complications will be assessed by clinical examination. The patients will receive standard treatment for headache in the form of drugs and if required an epidural blood patch ( injecting patient's blood in the epidural space). The course of...

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