Rehabilitation of Visuomotor Skills in Poststroke Patients Using the Dynavision Apparatus

1998 ◽  
Vol 86 (1) ◽  
pp. 23-30 ◽  
Author(s):  
Peter Klavora ◽  
Mary Warren
Keyword(s):  
Visual Field ◽  
Neurological Dysfunction ◽  
Oculomotor Control ◽  
Visual Skills ◽  
Visual Field Deficits ◽  
New Apparatus ◽  
Visuomotor Skills ◽  
Scanning Strategies ◽  
Basic Features ◽  
Visual Inattention

The Dynavision is a new apparatus that may help address some of the limitations inherent in conventional approaches to rehabilitation of visual skills of persons suffering from neurological dysfunction. Here the basic features of the apparatus are described, an overview of preliminary experimental evidence for its effectiveness in rehabilitation presented and application in the training of compensatory scanning strategies for visual inattention and visual-field deficits and in the increasing of oculomotor control outlined.

scholarly journals Do visual field deficits exacerbate visuo-spatial neglect?

1990 ◽  
Vol 53 (6) ◽  
pp. 487-491 ◽  
Author(s):  
P W Halligan ◽  
J C Marshall ◽  
D T Wade
Keyword(s):  
Visual Field ◽  
Spatial Neglect ◽  
Visual Field Deficits

Red Desaturation and Visual Field Deficits in Detecting Chiasmopathy in Patients with Nonfunctioning Pituitary Macroadenoma

2011 ◽  
pp. P1-430-P1-430
Author(s):  
Emily Shortridge ◽  
Brian Kim ◽  
William White ◽  
Andrew Little ◽  
Kristina Chapple ◽  
...  
Keyword(s):  
Visual Field ◽  
Pituitary Macroadenoma ◽  
Visual Field Deficits

Optic radiation tractography integrated into simulated treatment planning for Gamma Knife surgery

2007 ◽  
Vol 107 (4) ◽  
pp. 721-726 ◽  
Author(s):  
Keisuke Maruyama ◽  
Kyousuke Kamada ◽  
Masahiro Shin ◽  
Daisuke Itoh ◽  
Yoshitaka Masutani ◽  
...  
Keyword(s):  
Visual Field ◽  
Treatment Planning ◽  
Gamma Knife ◽  
Diffusion Tensor ◽  
Maximum Dose ◽  
Gamma Knife Surgery ◽  
Optic Radiation ◽  
Imaging Studies ◽  
Visual Field Deficits ◽  
Neurological Change

Object No definitive method of preventing visual field deficits after stereotactic radiosurgery for lesions near the optic radiation (OR) has been available so far. The authors report the results of integrating OR tractography based on diffusion tensor (DT) magnetic resonance imaging into simulated treatment planning for Gamma Knife surgery (GKS). Methods Data from imaging studies performed in 10 patients who underwent GKS for treatment of arteriovenous malformations (AVMs) located adjacent to the OR were used for the simulated treatment planning. Diffusion tensor images performed without the patient's head being secured by a stereotactic frame were used for DT tractography, and the OR was visualized by means of software developed by the authors. Data from stereotactic 3D imaging studies performed after frame fixation were coregistered with the data from DT tractography. The combined images were transferred to a GKS treatment-planning workstation. Delivered doses and distances between the treated lesions and the OR were analyzed and correlated with posttreatment neurological changes. Results In patients presenting with migraine with visual aura or occipital lobe epilepsy, the OR was located within 11 mm from AVMs. In a patient who developed new quadrantanopia after GKS, the OR had received 32 Gy. A maximum dose to the OR of less than 12 Gy did not cause new visual field deficits. A maximum dose to the OR of 8 Gy or more was significantly related to neurological change (p < 0.05), including visual field deficits and development or improvement of migraine. Conclusions Integration of OR tractography into GKS represents a promising tool for preventing GKS-induced visual disturbances and headaches. Single-session irradiation at a dose of 8 Gy or more was associated with neurological change.

The Pattern Electroretinogram in Glaucoma Patients with Confirmed Visual Field Deficits

2005 ◽  
Vol 46 (7) ◽  
pp. 2411 ◽  
Author(s):  
Donald C. Hood ◽  
Li Xu ◽  
Phamornsak Thienprasiddhi ◽  
Vivienne C. Greenstein ◽  
Jeffrey G. Odel ◽  
...  
Keyword(s):  
Visual Field ◽  
Pattern Electroretinogram ◽  
Visual Field Deficits

scholarly journals Visual field deficits after epilepsy surgery: a new quantitative scoring method

2018 ◽  
Vol 160 (7) ◽  
pp. 1325-1336 ◽  
Author(s):  
Rick H. G. J. van Lanen ◽  
M. C. Hoeberigs ◽  
N. J. C. Bauer ◽  
R. H. L. Haeren ◽  
G. Hoogland ◽  
...  
Keyword(s):  
Visual Field ◽  
Epilepsy Surgery ◽  
Scoring Method ◽  
Visual Field Deficits ◽  
Quantitative Scoring

Somatosensory Impairments, Falls History and Fear of Falling in Glaucoma - A Survey Study Approach

2021 ◽  
Vol 65 (1) ◽  
pp. 11-15
Author(s):  
Caitlin O’Connell ◽  
Gadi Wollstein ◽  
Ian P. Conner ◽  
Mark S. Redfern ◽  
Kevin C. Chan ◽  
...  
Keyword(s):  
Visual Field ◽  
Older Workers ◽  
Daily Living ◽  
Fear Of Falling ◽  
Survey Study ◽  
Risk Of Falling ◽  
Study Approach ◽  
Increased Risk ◽  
Visual Field Deficits ◽  
The Relationship

The primary aim was to determine if somatosensory impairments alter the association between falls history and glaucoma severity. A secondary aim was to identify the activities of daily living that cause increased concern related to falling in glaucoma and their association with glaucoma severity. Established questionnaires about falls and fear of falling (FoF) were mailed to participants diagnosed with glaucoma. Ninety-eight participants responded. Self-reported feet numbness and tingling symptoms were used to determine the presence of somatosensory impairments. Self-reported falls in glaucoma are associated with visual field deficits in both eyes, particularly in the presence of somatosensory impairments. In addition, increased FoF levels are linked with worse visual field deficits in both eyes, especially when performing challenging walking tasks. Somatosensory impairments alter the relationship between falls risk and visual field deficits in glaucoma. This information may be helpful in identifying older workers at an increased risk of falling.

scholarly journals Changes in the Spatial Distribution of Visual Attention after Early Deafness

2002 ◽  
Vol 14 (5) ◽  
pp. 687-701 ◽  
Author(s):  
Jason Proksch ◽  
Daphne Bavelier
Keyword(s):  
Visual Field ◽  
Visual Attention ◽  
Visual Information ◽  
Search Task ◽  
Peripheral Visual Field ◽  
Auditory Deprivation ◽  
Attentional Processing ◽  
Attentional Resources ◽  
Visual Skills ◽  
Visual Tasks

There is much anecdotal suggestion of improved visual skills in congenitally deaf individuals. However, this claim has only been met by mixed results from careful investigations of visual skills in deaf individuals. Psychophysical assessments of visual functions have failed, for the most part, to validate the view of enhanced visual skills after deafness. Only a few studies have shown an advantage for deaf individuals in visual tasks. Interestingly, all of these studies share the requirement that participants process visual information in their peripheral visual field under demanding conditions of attention. This work has led us to propose that congenital auditory deprivation alters the gradient of visual attention from central to peripheral field by enhancing peripheral processing. This hypothesis was tested by adapting a search task from Lavie and colleagues in which the interference from distracting information on the search task provides a measure of attentional resources. These authors have established that during an easy central search for a target, any surplus attention remaining will involuntarily process a peripheral distractor that the subject has been instructed to ignore. Attentional resources can be measured by adjusting the difficulty of the search task to the point at which no surplus resources are available for the distractor. Through modification of this paradigm, central and peripheral attentional resources were compared in deaf and hearing individuals. Deaf individuals possessed greater attentional resources in the periphery but less in the center when compared to hearing individuals. Furthermore, based on results from native hearing signers, it was shown that sign language alone could not be responsible for these changes. We conclude that auditory deprivation from birth leads to compensatory changes within the visual system that enhance attentional processing of the peripheral visual field.

Quick phases control ocular torsion during smooth pursuit

2011 ◽  
Vol 106 (5) ◽  
pp. 2151-2166 ◽  
Author(s):  
Bernhard J. M. Hess ◽  
Jakob S. Thomassen
Keyword(s):  
Eye Movements ◽  
Visual Field ◽  
Rotation Axis ◽  
Three Dimensional ◽  
Oculomotor Control ◽  
Visually Guided ◽  
Open Questions ◽  
Spatial Frequencies ◽  
Eye Rotation ◽  
Smooth Tracking

One of the open questions in oculomotor control of visually guided eye movements is whether it is possible to smoothly track a target along a curvilinear path across the visual field without changing the torsional stance of the eye. We show in an experimental study of three-dimensional eye movements in subhuman primates ( Macaca mulatta) that although the pursuit system is able to smoothly change the orbital orientation of the eye's rotation axis, the smooth ocular motion was interrupted every few hundred milliseconds by a small quick phase with amplitude <1.5° while the animal tracked a target along a circle or ellipse. Specifically, during circular pursuit of targets moving at different angular eccentricities (5°, 10°, and 15°) relative to straight ahead at spatial frequencies of 0.067 and 0.1 Hz, the torsional amplitude of the intervening quick phases was typically around 1° or smaller and changed direction for clockwise vs. counterclockwise tracking. Reverse computations of the eye rotation based on the recorded angular eye velocity showed that the quick phases facilitate the overall control of ocular orientation in the roll plane, thereby minimizing torsional disturbances of the visual field. On the basis of a detailed kinematic analysis, we suggest that quick phases during curvilinear smooth tracking serve to minimize deviations from Donders' law, which are inevitable due to the spherical configuration space of smooth eye movements.

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