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binocular vision dysfunction

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https://www.readbyqxmd.com/read/28511578/retinal-atrophy-in-relation-to-visual-functioning-and-vision-related-quality-of-life-in-patients-with-multiple-sclerosis
#1
Lisanne J Balk, Danko Coric, Jenny A Nij Bijvank, Joep Killestein, Bernard Mj Uitdehaag, Axel Petzold
BACKGROUND: Inner retinal layer atrophy in patients with multiple sclerosis (MS) has been validated as a structural imaging biomarker for neurodegeneration. OBJECTIVE: To determine how retinal layer thickness relates to high-contrast visual acuity (HCVA), low-contrast visual acuity (LCVA) and vision-related quality of life (QoL) and to investigate the effect of previous episodes on MS-associated optic neuritis (MSON). METHODS: Spectral-domain optical coherence tomography (SD-OCT) was performed in 267 patients with MS...
May 1, 2017: Multiple Sclerosis: Clinical and Laboratory Research
https://www.readbyqxmd.com/read/28494496/sensitivity-to-binocular-disparity-is-reduced-by-mild-traumatic-brain-injury
#2
Gunnar Schmidtmann, Tatiana Ruiz, Alexandre Reynaud, Daniel P Spiegel, Maude Laguë-Beauvais, Robert F Hess, Reza Farivar
Purpose: The impairment of visual functions is one of the most common complaints following mild traumatic brain injury (mTBI). Traumatic brain injury-associated visual deficits include blurred vision, reading problems, and eye strain. In addition, previous studies have found evidence that TBI can diminish early cortical visual processing, particularly for second-order stimuli. We investigated whether cortical processing of binocular disparity is also affected by mTBI. Methods: In order to investigate the influence of mTBI on global stereopsis, we measured the quick Disparity Sensitivity Function (qDSF) in 22 patients with mTBI...
May 1, 2017: Investigative Ophthalmology & Visual Science
https://www.readbyqxmd.com/read/28476060/blur-perception-throughout-the-visual-field-in-myopia-and-emmetropia
#3
Guido Maiello, Lenna Walker, Peter J Bex, Fuensanta A Vera-Diaz
We evaluated the ability of emmetropic and myopic observers to detect and discriminate blur across the retina under monocular or binocular viewing conditions. We recruited 39 young (23-30 years) healthy adults (n = 19 myopes) with best-corrected visual acuity 0.0 LogMAR (20/20) or better in each eye and no binocular or accommodative dysfunction. Monocular and binocular blur discrimination thresholds were measured as a function of pedestal blur using naturalistic stimuli with an adaptive 4AFC procedure. Stimuli were presented in a 46° diameter window at 40 cm...
May 1, 2017: Journal of Vision
https://www.readbyqxmd.com/read/28440687/the-consequence-of-spatial-visual-processing-dysfunction-caused-by-traumatic-brain-injury-tbi
#4
William V Padula, Jose E Capo-Aponte, William V Padula, Eric L Singman, Jonathan Jenness
OBJECTIVE: A bi-modal visual processing model is supported by research to affect dysfunction following a traumatic brain injury (TBI). TBI causes dysfunction of visual processing affecting binocularity, spatial orientation, posture and balance. Research demonstrates that prescription of prisms influence the plasticity between spatial visual processing and motor-sensory systems improving visual processing and reducing symptoms following a TBI. RATIONALE: The rationale demonstrates that visual processing underlies the functional aspects of binocularity, balance and posture...
April 25, 2017: Brain Injury: [BI]
https://www.readbyqxmd.com/read/28137897/blood-brain-and-binocular-vision
#5
Egle Rostron, Mary Polly Dickerson, Gregory Heath
A man aged 51 years presented with sudden onset, horizontal, binocular, double vision and right facial weakness. Ocular motility examination demonstrated a right horizontal gaze palsy pattern in keeping with a one-and-a-half syndrome. Since this was associated with a concomitant, ipsilateral, lower motor neuron (LMN) facial (VIIth) cranial nerve palsy, he had acquired an eight-and-a-half syndrome. Diffusion-weighted MRI confirmed a small infarcted area in the pons of the brainstem which correlated with anatomical location of the horizontal gaze centre and VIIth cranial nerve fasciculus...
January 30, 2017: BMJ Case Reports
https://www.readbyqxmd.com/read/27472185/20-40-or-better-visual-acuity-after-optic-neuritis-not-as-good-as-we-once-thought
#6
Sakinah B Sabadia, Rachel C Nolan, Kristin M Galetta, Kannan M Narayana, James A Wilson, Peter A Calabresi, Elliot M Frohman, Steven L Galetta, Laura J Balcer
BACKGROUND: Although patients with acute optic neuritis (ON) recover high-contrast visual acuity (HCVA) to 20/40 or better in 95% of affected eyes, patients with a history of ON continue to note subjective abnormalities of vision. Furthermore, substantial and permanent thinning of the retinal nerve fiber layer (RNFL) and the ganglion cell layer (GCL) is now known to occur early in the course of ON. We measured vision-specific quality of life (QOL) in patients with a history of acute ON and recovery of VA to 20/40 or better in their affected eyes to determine how these QOL scores relate to RNFL and GCL thickness and low-contrast letter acuity (LCLA) across the spectrum of visual recovery...
December 2016: Journal of Neuro-ophthalmology: the Official Journal of the North American Neuro-Ophthalmology Society
https://www.readbyqxmd.com/read/27464572/vision-therapy-for-binocular-dysfunction-post-brain-injury
#7
Joseph Samuel Conrad, G Lynn Mitchell, Marjean Taylor Kulp
PURPOSE: To prospectively evaluate the effectiveness of home-based computer vergence therapy for the treatment of binocular vision disorders in adults at least 3 months after an acquired brain injury. METHODS: Eligibility criteria included presence of binocular dysfunction characterized by receded near point of convergence (≥6 cm break), insufficient positive fusional vergence at near (failing Sheard's criterion or <15△ blur or break), insufficient negative fusional vergence at near (<12△ blur or break), and/or reduced vergence facility at near (<15 cycles per minute with 12△BO/3△BI)...
January 2017: Optometry and Vision Science: Official Publication of the American Academy of Optometry
https://www.readbyqxmd.com/read/27429357/anoxic-brain-injury-secondary-to-metabolic-encephalopathy
#8
Lyndsey M Ferris, Carla Engelke
PURPOSE: To discuss the clinical case of a patient suffering visual dysfunction secondary to a metabolic brain injury, the patient's visual rehabilitative treatment, and outcomes. CASE REPORT: A 24-year-old Caucasian male presented to the Southern Arizona Veteran's Affairs Healthcare System's Traumatic Brain Injury (TBI) eye clinic for evaluation and treatment of visual dysfunction secondary to an anoxic brain injury suffered 4 months before. Symptoms included persistent right homonymous hemianopia, oculomotor dysfunction, and a visual information processing deficit...
October 2016: Optometry and Vision Science: Official Publication of the American Academy of Optometry
https://www.readbyqxmd.com/read/27366692/visual-and-ocular-effects-from-the-use-of-flat-panel-displays
#9
Esteban Porcar, Alvaro M Pons, Amalia Lorente
AIM: To evaluate the prevalence of eye symptoms in a non-presbyopic population of video display unit (VDU) users with flat-panel displays. METHODS: One hundred and sixteen VDU users with flat-panel display from an urban population participated in the study; their ages ranging from 20 to 34y. There were 60 females and 56 males. An eye examination to rule out the presence of significant uncorrected refractive errors, general binocular dysfunctions and eye conditions was carried out...
2016: International Journal of Ophthalmology
https://www.readbyqxmd.com/read/27275434/binocular-vision-and-abnormal-head-posture-in-children-when-watching-television
#10
Di Zhang, Wei-Hong Zhang, Shu-Zhen Dai, Hai-Ying Peng, Li-Ya Wang
AIM: To determine the association between the binocular vision and an abnormal head posture (AHP) when watching television (TV) in children 7-14y of age. METHODS: Fifty normal children in the normal group and 52 children with an AHP when watching TV in the AHP group were tested for spherical equivalents, far and near fusional convergence (FC) and fusional divergence (FD) amplitudes, near point of convergence, far and near heterophoria, accommodative convergence/ accommodation ratio and stereoacuity...
2016: International Journal of Ophthalmology
https://www.readbyqxmd.com/read/27269597/effects-of-cortical-damage-on-binocular-depth-perception
#11
REVIEW
Holly Bridge
Stereoscopic depth perception requires considerable neural computation, including the initial correspondence of the two retinal images, comparison across the local regions of the visual field and integration with other cues to depth. The most common cause for loss of stereoscopic vision is amblyopia, in which one eye has failed to form an adequate input to the visual cortex, usually due to strabismus (deviating eye) or anisometropia. However, the significant cortical processing required to produce the percept of depth means that, even when the retinal input is intact from both eyes, brain damage or dysfunction can interfere with stereoscopic vision...
June 19, 2016: Philosophical Transactions of the Royal Society of London. Series B, Biological Sciences
https://www.readbyqxmd.com/read/26844467/clinical-characteristics-and-surgical-outcomes-in-patients-with-intermittent-exotropia-a-large-sample-study-in-south-china
#12
Min Yang, Jingchang Chen, Tao Shen, Ying Kang, Daming Deng, Xiaoming Lin, Heping Wu, Qiwen Chen, Xuelian Ye, Jianqun Li, Jianhua Yan
The clinical characteristics and surgical outcomes in a large sample of patients with intermittent exotropia (IXT) as well as an analysis of risk factors associated with surgical failures are presented in this article. Data from IXT patients who received surgical management at the Eye Hospital, in the Zhongshan Ophthalmic Center, of Sun Yat-Sen University, China from January 2009 to December 2013 were reviewed retrospectively. Included within this analysis were data from pre- and postoperative ocular motility, primary alignment, and binocular vision...
February 2016: Medicine (Baltimore)
https://www.readbyqxmd.com/read/26829465/treatment-of-vertical-heterophoria-ameliorates-persistent-post-concussive-symptoms-a-retrospective-analysis-utilizing-a-multi-faceted-assessment-battery
#13
Mark S Rosner, Debby L Feinberg, Jennifer E Doble, Arthur J Rosner
PRIMARY OBJECTIVE: To examine the effectiveness of neutralizing prismatic lenses for reduction of headache, dizziness and anxiety in patients with persistent post-concussive symptoms and vertical heterophoria (VH). BACKGROUND: Approximately 5-10% of patients with traumatic brain injury (TBI) develop persistent post-concussive symptoms. Many rehabilitation/treatment modalities are tried, but are largely unsuccessful, indicating a need for more effective treatment...
2016: Brain Injury: [BI]
https://www.readbyqxmd.com/read/26762276/disparity-vergence-responses-before-versus-after-repetitive-vergence-therapy-in-binocularly-normal-controls
#14
Henry Talasan, Mitchell Scheiman, Xiaobo Li, Tara L Alvarez
This study sought to determine whether significant changes would be observed between vergence eye movements before and after 12 hr of repetitive vergence therapy (1 hr per day on different days) in subjects with normal binocular vision compared to controls. Disparity vergence responses from 23 subjects were studied. An assessment protocol that minimized the influence of the near dissociated phoria on the disparity vergence system was designed. The following parameters were quantified for the responses: latency, time to peak velocity, settling time, peak velocity, and accuracy (difference between the response and stimulus amplitudes)...
2016: Journal of Vision
https://www.readbyqxmd.com/read/26379615/deficits-in-the-activation-of-human-oculomotor-nuclei-in-chronic-traumatic-brain-injury
#15
Christopher W Tyler, Lora T Likova, Kristyo N Mineff, Spero C Nicholas
Binocular eye movements form a finely tuned system that requires accurate coordination of the oculomotor dynamics of the brainstem control nuclei when tracking the fine binocular disparities required for 3D vision. They are particularly susceptible to disruption by brain injury and other neural dysfunctions. Here, we report functional magnetic resonance imaging activation of the brainstem oculomotor control nuclei by binocular saccadic and vergence eye movements, and significant reductions in their response amplitudes in mild or diffuse traumatic brain injury (dTBI)...
2015: Frontiers in Neurology
https://www.readbyqxmd.com/read/26377458/3d-shape-perception-in-posterior-cortical-atrophy-a-visual-neuroscience-perspective
#16
Céline R Gillebert, Jolien Schaeverbeke, Christine Bastin, Veerle Neyens, Rose Bruffaerts, An-Sofie De Weer, Alexandra Seghers, Stefan Sunaert, Koen Van Laere, Jan Versijpt, Mathieu Vandenbulcke, Eric Salmon, James T Todd, Guy A Orban, Rik Vandenberghe
UNLABELLED: Posterior cortical atrophy (PCA) is a rare focal neurodegenerative syndrome characterized by progressive visuoperceptual and visuospatial deficits, most often due to atypical Alzheimer's disease (AD). We applied insights from basic visual neuroscience to analyze 3D shape perception in humans affected by PCA. Thirteen PCA patients and 30 matched healthy controls participated, together with two patient control groups with diffuse Lewy body dementia (DLBD) and an amnestic-dominant phenotype of AD, respectively...
September 16, 2015: Journal of Neuroscience: the Official Journal of the Society for Neuroscience
https://www.readbyqxmd.com/read/26270188/implicit-motor-learning-is-impaired-in-strabismic-adults
#17
A Przekoracka-Krawczyk, P Nawrot, T Kopyciuk, R Naskrecki
Binocular vision disorders (BVD) are quite common in subjects with cerebellar dysfunctions. Also individuals with strabismus often suffer from many motor deficits, such as impaired body balance and walking. It is known that the cerebellum is necessary to maintain proper body posture but also to learn motor skills. It is conceivable that subjects with BVD would also have deficits in procedural (implicit) motor learning, one of the primary cerebellar functions. The primary aim of this study was to explore motor learning abilities in subjects with BVD (strabismic group, SG)...
August 1, 2015: Journal of Vision
https://www.readbyqxmd.com/read/26261229/prevalence-of-amblyopia-and-strabismus-in-eastern-china-results-from-screening-of-preschool-children-aged-36-72%C3%A2-months
#18
Xuejuan Chen, Zhujun Fu, Jiajia Yu, Hui Ding, Jing Bai, Ji Chen, Yu Gong, Hui Zhu, Rongbing Yu, Hu Liu
PURPOSE: To determine the prevalence of amblyopia and strabismus in preschool children in Eastern China. METHODS: The Nanjing Pediatric Vision Project was a cross-sectional, population-based cohort study conducted in preschool children aged 36-72 months from 2011 to 2012 in Yuhua District, Nanjing, China, using an age-stratified random sampling procedure. A questionnaire totalling 117 items was sent to be completed by the corresponding parents or legal guardians of each eligible child...
April 2016: British Journal of Ophthalmology
https://www.readbyqxmd.com/read/26258274/the-effects-of-vertical-yoked-prism-on-horizontal-heterophoria
#19
Lisa Asper, Andrew Leung, Catrin Tran, Catherine M Suttle, Kathleen Watt
PURPOSE: Vertical yoked prisms (VYPs) have been recommended for the remediation of vergence dysfunction, but the evidence base for their use is mostly low level. This study investigates the effect of VYP on horizontal subjective dissociated heterophoria. METHODS: Phoria measurement was performed in primary gaze with the Modified Thorington technique at 3 m and at 40 cm on 40 nonpresbyopic young adults. Subjects were seated and head position was held constant. Baseline measures (without yoked prism) of distance and near phoria were measured...
October 2015: Optometry and Vision Science: Official Publication of the American Academy of Optometry
https://www.readbyqxmd.com/read/26195047/relation-of-quantitative-visual-and-neurologic-outcomes-to-fatigue-in-multiple-sclerosis
#20
Salim Chahin, Deborah Miller, Reiko E Sakai, James A Wilson, Teresa Frohman, Clyde Markowitz, Dina Jacobs, Ari Green, Peter A Calabresi, Elliot M Frohman, Steven L Galetta, Laura J Balcer
BACKGROUND: The relation of fatigue in multiple sclerosis (MS) to the visual system, an emerging structural and functional surrogate in MS, has not been well established. OBJECTIVE: We examined how physical and cognitive fatigue could be associated with visual dysfunction and neurologic impairment. METHODS: At a single time-point, we assessed 143 patients with: Low-contrast letter acuity (LCLA) and high-contrast visual acuity (VA) testing, the 25-Item National Eye Institute Visual Functioning Questionnaire (NEI-VFQ-25) and Neuro-Ophthalmic Supplement, the Modified Fatigue Impact Scale (MFIS), the MS Functional Composite (MSFC), and the Expanded Disability Status Scale (EDSS)...
July 2015: Multiple Sclerosis and related Disorders
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