Archive for category Hemianopsia
[Case Study] Transcranial direct current stimulation (tDCS) combined with blindsight rehabilitation for the treatment of homonymous hemianopia: a report of two-cases – Full Text PDF
[Purpose] Homonymous hemianopia is one of the most common symptoms following neurologic damage leading to impairments of functional abilities and activities of daily living. There are two main types of restorative
rehabilitation in hemianopia: “border training” which involves exercising vision at the edge of the damaged visual field, and “blindsight training,” which is based on exercising the unconscious perceptual functions deep
inside the blind hemifield. Only border effects have been shown to be facilitated by transcranial direct current stimulation (tDCS). This pilot study represents the first attempt to associate the modulatory effects of tDCS over
the parieto-occipital cortex to blindsight treatment in the rehabilitation of the homonymous hemianopia.
[Subjects and Methods] Patients TA and MR both had chronic hemianopia. TA underwent blindsight treatment which was combined with tDCS followed by blindsight training alone. MR underwent the two training rounds in reverse order.
[Results] The patients showed better scores in clinical-instrumental, functional, and ecological assessments after tDCS combined with blindsight rehabilitation rather than rehabilitation alone. [Conclusion] In this two-case report parietal-occipital tDCS modulate the effects induced by blindsight treatment on hemianopia.
[Conclusion] In this two-case report parietal-occipital tDCS modulate the effects induced by blindsight treatment on hemianopia.
[Abstract] From cortical blindness to conscious visual perception: Theories on neuronal networks and visual training strategies
Homonymous hemianopia (HH) is the most common cortical visual impairment leading to blindness in the contralateral hemifield. It is associated with many inconveniences and daily restrictions such as exploration and visual orientation difficulties. However, patients with HH can preserve the remarkable ability to unconsciously perceive visual stimuli presented in their blindfield, a phenomenon known as blindsight. Unfortunately, the nature of this captivating residual ability is still misunderstood and the rehabilitation strategies have been insufficiently exploited. This paper discusses type I and type II blindsight in a neuronal framework of altered global workspace, resulting from inefficient perception, attention and conscious networks. To enhance synchronisation and create global availability for residual abilities to reach visual consciousness, rehabilitation tools need to stimulate subcortical extrastriate pathways through V5/MT. Multisensory bottom-up compensation combined with top-down restitution training could target pre-existing and new neuronal mechanisms to recreate a framework for potential functionality.
[ARTICLE] The Alteration Visual Field Defect in Ischemic Stroke Patients After Three Months Therapy – Full Text PDF
Background: Ischemic stroke are lack of blood flow to the brain and it could influence the visual field. Approximately more than half of the ischemic stroke patient have visual defect.
Objective : Disturbance of blood flow on visual pathway have impact to the visual field defect. In stroke ischemic patient, recirculation of penumbra at the brain on the third months after onset can rehabilitate the visual pathway, also it will improve the outcome of visual filed defect. So it could be initial detection for rehabiltation of visual field defect.
Methods: This study was intended to compere visual field defect of ischemic stroke patient after three months therapy conducted form September 2014 – February 2015 in Mohammad Hoesin General Hospital Palembang. A total of 12 patients who met the inclusion criteria were recruited by consecutive sampling. All patients were endure based on ophthalmology and visual field examination using Humphrey Field Analyzer twice. First after relieving from the attack of stroke and second after three months therapy. Measurement of standard have to compare the value of MD, VFI, PSD, PD and pattern visual field defect.
Results: There were significant difference in value of MD, VFI, PSD and PD<0,5% for both eyes on stroke ischemic patients after three months therapy. Almost all variable value were increasing to improvement of defect. The most common type of visual field defect is homonymous hemianopia.
Conclusion: There were improvement in visual field defect in patients with stroke ischemic after three months therapy.
Full Text: PDF
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In this article, the authors focus on rehabilitation of patients with acquired brain injury from both traumatic and nontraumatic causes. Rehabilitative strategies include both restorative therapies that serve to regain function and compensatory strategies that allow for compensation of lost function. Rehabilitation can occur in both inpatient and outpatient settings and involves multiple providers, including physical therapists, occupational therapists, and speechlanguage pathologists. This review will focus on the functional impairments that arise from acquired brain injury and the role of rehabilitative strategies to enhance neurologic recovery and improved functional outcomes.
- Acquired brain injury is a leading cause of disability in the United States.
- Neuroplasticity refers to reorganization of neural connections to allow for functional recovery after acquired brain injury.
- Early rehabilitation is important for neuroplasticity and improved neurologic recovery, and task-specific therapies are the most effective.
- Compensatory strategies can be particularly helpful for the rehabilitation of patients with dysphagia, visual impairments, and neglect.
[Abstract] Review of rehabilitation and habilitation strategies for children and young people with homonymous visual field loss caused by cerebral vision impairment
Partial and homonymous visual field loss (HVFL) is a common consequence of post-chiasmatic injury to the primary visual pathway or injury to the primary visual cortex. Different approaches to rehabilitation have been reported for older adults with HVFL and there is evidence to support the use of compensatory training over other proposed therapies. We reviewed the literature to investigate the current state of the art of rehabilitation and habilitation strategies for children and young people with HVFL, and whether there is enough evidence to support the use of these strategies in the paediatric population. We have provided an overview of the existing literature on children and young people with HVFL, a brief overview of rehabilitation strategies for adults with HVFL, and evidence on whether these different interventions have been applied with children and young people effectively. We found that there have been very few studies to investigate these strategies with children and young people, and the quality of evidence is currently low. New research is required to evaluate which strategies are effective for children and young people with HVFL and whether new strategies need to be developed.
Hemianopia explained and simulated using an eye-tracker
Strategies for adapting a computer for use by people with visual field deficits.