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Ocular motor

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https://www.readbyqxmd.com/read/28448671/disrupted-eye-movements-in-preperimetric-primary-open-angle-glaucoma
#1
Raymond P Najjar, Sourabh Sharma, Morgane Drouet, Stephanie Leruez, Mani Baskaran, Monisha E Nongpiur, Tin Aung, Joanne Fielding, Owen White, Michael J Girard, Cédric Lamirel, Dan Milea
Purpose: Primary open-angle glaucoma (POAG) can be associated with abnormal ocular motor behavior, possibly as a compensatory strategy following visual field loss. The aim of this study was to explore the characteristics of saccadic eye movements in patients with early-stage POAG without any detectable glaucomatous visual field loss (i.e., preperimetric POAG). Methods: Binocular eye movements were explored in 16 patients with bilateral preperimetric POAG and 16 age-matched healthy controls in a cross-sectional, observational study...
April 1, 2017: Investigative Ophthalmology & Visual Science
https://www.readbyqxmd.com/read/28444617/computational-theory-underlying-acute-vestibulo-ocular-reflex-motor-learning-with-cerebellar-long-term-depression-and-long-term-potentiation
#2
Keiichiro Inagaki, Yutaka Hirata
The vestibulo-ocular reflex (VOR) can be viewed as an adaptive control system that maintains compensatory eye movements during head motion. As the cerebellar flocculus is intimately involved in this adaptive motor control of the VOR, the VOR has been a popular model system for investigating cerebellar motor learning. Long-term depression (LTD) and long-term potentiation (LTP) at the parallel fiber-Purkinje cell synapses are considered to play major roles in cerebellar motor learning. A recent study using mutant mice demonstrated cerebellar motor learning with hampered LTD; the study concluded that the parallel fiber-Purkinje cell LTD is not essential...
April 25, 2017: Cerebellum
https://www.readbyqxmd.com/read/28439720/the-impact-of-oral-promethazine-on-human-whole-body-motion-perceptual-thresholds
#3
Ana Diaz-Artiles, Adrian J Priesol, Torin K Clark, David P Sherwood, Charles M Oman, Laurence R Young, Faisal Karmali
Despite the widespread treatment of motion sickness symptoms using drugs and the involvement of the vestibular system in motion sickness, little is known about the effects of anti-motion sickness drugs on vestibular perception. In particular, the impact of oral promethazine, widely used for treating motion sickness, on vestibular perceptual thresholds has not previously been quantified. We examined whether promethazine (25 mg) alters vestibular perceptual thresholds in a counterbalanced, double-blind, within-subject study...
April 24, 2017: Journal of the Association for Research in Otolaryngology: JARO
https://www.readbyqxmd.com/read/28437527/ocular-motor-nerve-development-in-the-presence-and-absence-of-extraocular-muscle
#4
Suzanne M Michalak, Mary C Whitman, Jong G Park, Max A Tischfield, Elaine H Nguyen, Elizabeth C Engle
Purpose: To spatially and temporally define ocular motor nerve development in the presence and absence of extraocular muscles (EOMs). Methods: Myf5cre mice, which in the homozygous state lack EOMs, were crossed to an IslMN:GFP reporter line to fluorescently label motor neuron cell bodies and axons. Embryonic day (E) 11.5 to E15.5 wild-type and Myf5cre/cre:IslMN:GFP whole mount embryos and dissected orbits were imaged by confocal microscopy to visualize the developing oculomotor, trochlear, and abducens nerves in the presence and absence of EOMs...
April 1, 2017: Investigative Ophthalmology & Visual Science
https://www.readbyqxmd.com/read/28429801/the-dizzy-patient-don-t-forget-disorders-of-the-central-vestibular-system
#5
REVIEW
Thomas Brandt, Marianne Dieterich
Vertigo and dizziness are among the most common complaints in neurology clinics, and they account for about 13% of the patients entering emergency units. In this Review, we focus on central vestibular disorders, which are mostly attributable to acute unilateral lesions of the bilateral vestibular circuitry in the brain. In a tertiary interdisciplinary outpatient dizziness unit, central vestibular disorders, including vestibular migraine, comprise about 25% of the established diagnoses. The signs and symptoms of these disorders can mimic those of peripheral vestibular disorders with sustained rotational vertigo...
April 21, 2017: Nature Reviews. Neurology
https://www.readbyqxmd.com/read/28422801/interrater-and-test-retest-reliability-of-the-beery-visual-motor-integration-in-schoolchildren
#6
Erin M Harvey, Tina K Leonard-Green, Kathleen M Mohan, Marjean Taylor Kulp, Amy L Davis, Joseph M Miller, J Daniel Twelker, Irene Campus, Leslie K Dennis
PURPOSE: To assess interrater and test-retest reliability of the 6th Edition Beery-Buktenica Developmental Test of Visual-Motor Integration (VMI) and test-retest reliability of the VMI Visual Perception Supplemental Test (VMIp) in school-age children. METHODS: Subjects were 163 Native American third- to eighth-grade students with no significant refractive error (astigmatism <1.00 D, myopia <0.75 D, hyperopia <2.50 D, anisometropia <1.50 D) or ocular abnormalities...
May 2017: Optometry and Vision Science: Official Publication of the American Academy of Optometry
https://www.readbyqxmd.com/read/28410563/wernicke-s-encephalopathy-following-reduced-food-intake-due-to-depressive-disorders
#7
Donato Melchionda, Tommaso Martino, Elena Carapelle, Alessandra Lalla, Daniela Cologno, Carlo Avolio
Wernicke's encephalopathy (WE) is an unexpected common neurological disorder caused by thiamine deficiency often due to alcohol abuse, but WE-not alcohol related is also frequent. A prolonged reduction of food intake can cause WE. This condition can arise in depression disorders, especially in the early stages of these psychiatric syndromes. WE is characterized by the triad of signs: ataxia, ocular dysfunctions and confusional state. However, they rarely appear together and this makes the diagnosis particularly difficult, especially when there is not a history of alcohol abuse...
April 14, 2017: Nutritional Neuroscience
https://www.readbyqxmd.com/read/28410279/ocular-motor-manifestations-of-multiple-sclerosis
#8
Elodie Nerrant, Caroline Tilikete
BACKGROUND: Multiple sclerosis (MS) is a demyelinating disease of the central nervous system leading to disability, especially in young patients. Acute or chronic lesions of MS within the brainstem and the cerebellum frequently result in ocular motor disorders. EVIDENCE ACQUISITION: This review encompasses the spectrum of ocular motor disorders in patients with MS emphasizing prevalence, examination findings, diagnostic features, functional consequences, classification of MS course, and management of these disturbances of ocular motility...
April 13, 2017: Journal of Neuro-ophthalmology: the Official Journal of the North American Neuro-Ophthalmology Society
https://www.readbyqxmd.com/read/28409282/motor-neuron-vulnerability-and-resistance-in-amyotrophic-lateral-sclerosis
#9
REVIEW
Jik Nijssen, Laura H Comley, Eva Hedlund
In the fatal disease-amyotrophic lateral sclerosis (ALS)-upper (corticospinal) motor neurons (MNs) and lower somatic MNs, which innervate voluntary muscles, degenerate. Importantly, certain lower MN subgroups are relatively resistant to degeneration, even though pathogenic proteins are typically ubiquitously expressed. Ocular MNs (OMNs), including the oculomotor, trochlear and abducens nuclei (CNIII, IV and VI), which regulate eye movement, persist throughout the disease. Consequently, eye-tracking devices are used to enable paralysed ALS patients (who can no longer speak) to communicate...
April 13, 2017: Acta Neuropathologica
https://www.readbyqxmd.com/read/28405788/electroneuromyographic-findings-in-pseudoexfoliation-syndrome
#10
Deniz Turgut Coban, Tuncay Cakir, Muhammet Kazim Erol, Gulsum Dogan, Berna Dogan, Meral Bilgilisoy Filiz, Naciye Fusun Toraman
PURPOSE: To examine peripheral electroneuromyographic findings in patients with ocular pseudoexfoliation syndrome (PEX) and to compare them controls without PEX. METHODS: A case-control study design was used to examine 31 patients with PEX and compare the findings with those of 31 age- and sex-matched healthy controls. All patients underwent complete ophthalmologic examination that included peripheral electroneuromyography examination. Motor and sensorial nerve conduction of the median, ulnar, tibial, peroneal, and sural nerve and the sympathetic skin response were measured...
April 12, 2017: International Ophthalmology
https://www.readbyqxmd.com/read/28399651/facial-pain-overlapping-syndromes
#11
Stefan Evers
Premise This review summarises the pain syndromes that overlap between headache and facial pain and overlap between pain and cranial nerve lesion. Problem These syndromes share two features in common. First, they show both cranial nerve impairment (e.g. palsy, autonomic dysfunction) and pain; second, they have inflammatory (and/or small vessel) processes as the underlying mechanism. A typical representative of these syndromes is recurrent painful ophthalmoplegic neuropathy, which was previously called ophthalmoplegic migraine and was regarded as a migraine subtype...
January 1, 2017: Cephalalgia: An International Journal of Headache
https://www.readbyqxmd.com/read/28392473/elucidating-the-behavioral-phenotype-of-patients-affected-with-mucolipidosis-iv-what-can-we-learn-from-the-parents
#12
Perri Segal, Ben Pode-Shakked, Annick Raas-Rothschild
BACKGROUND: Mucolipidosis type IV (ML-IV) is a rare autosomal recessive lysosomal storage disorder which presents with nonspecific developmental delay. Nowadays with the use of new tools such as next generation sequencing, more ML-IV affected patients are diagnosed. Still, identifying the behavioral phenotype might be of help for early diagnosis and anticipatory guidance, as well as for counseling of the families. OBJECTIVE: Identification of the behavioral characteristics of 12 ML-IV patients, aged from 2...
April 6, 2017: European Journal of Medical Genetics
https://www.readbyqxmd.com/read/28387548/review-of-vestibular-and-oculomotor-screening-and-concussion-rehabilitation
#13
Anthony P Kontos, Jamie McAllister Deitrick, Michael W Collins, Anne Mucha
Vestibular and oculomotor impairment and symptoms may be associated with worse outcomes after sport-related concussion (SRC), including prolonged recovery. In this review, we evaluate current findings on vestibular and oculomotor impairments as well as treatment approaches after SRC, and we highlight areas in which investigation is needed. Clinical researchers have intimated that recovery from SRC may follow certain clinical profiles that affect the vestibular and oculomotor pathways. Identifying clinical profiles may help to inform better treatment and earlier intervention to reduce recovery time after SRC...
March 2017: Journal of Athletic Training
https://www.readbyqxmd.com/read/28385301/marshall-m-parks-memorial-lecture-ocular-motor-misbehavior-in-children-where-neuro-ophthalmology-meets-strabismus
#14
REVIEW
Michael C Brodsky
Clinical diagnosis has been supplemented by neuroimaging advances, genetic discoveries, and molecular research to generate new neurobiological discoveries pertaining to early maldevelopment of ocular motor control systems. In this focused review, I examine recent paradigm shifts that have transformed our understanding of pediatric ocular motor disease at the prenuclear and infranuclear levels. The pathogenesis of complex ocular motor disorders, such as paradoxical pupillary constriction to darkness, benign tonic upgaze of infancy, congenital fibrosis syndrome, and the constellation of unique eye movements that accompany Joubert syndrome, are elucidated...
April 3, 2017: Ophthalmology
https://www.readbyqxmd.com/read/28380076/strength-of-baseline-inter-trial-correlations-forecasts-adaptive-capacity-in-the-vestibulo-ocular-reflex
#15
Kara H Beaton, Aaron L Wong, Steven B Lowen, Mark Shelhamer
Individual differences in sensorimotor adaptability may permit customized training protocols for optimum learning. Here, we sought to forecast individual adaptive capabilities in the vestibulo-ocular reflex (VOR). Subjects performed 400 head-rotation steps (400 trials) during a baseline test, followed by 20 min of VOR gain adaptation. All subjects exhibited mean baseline VOR gain of approximately 1.0, variable from trial to trial, and showed desired reductions in gain following adaptation with variation in extent across individuals...
2017: PloS One
https://www.readbyqxmd.com/read/28376021/vertical-head-thrusting-in-acquired-supranuclear-vertical-ophthalmoplegia
#16
Yeon-Hee Lee, Seong-Hae Jeong, Hyo-Jung Kim, Jeong-Min Hwang, Woohyuk Lee, Ji-Soo Kim
Patients with congenital ocular motor apraxia (OMA) typically show head thrusts while attempting to shift gaze. In congenital OMA, this compensatory head motion mostly occurs in the horizontal plane. Two patients with acquired palsy of voluntary vertical gaze and continuous upward gaze deviation, one from aortic surgery and the other from multiple infarctions involving the mesodiencephalic junction, showed intermittent downward head thrusting to redirect the eyes straight ahead or downward. The head thrusting behavior improved markedly after surgical correction of the upward gaze deviation in one patient...
April 3, 2017: Journal of Neuro-ophthalmology: the Official Journal of the North American Neuro-Ophthalmology Society
https://www.readbyqxmd.com/read/28365885/the-spectrum-of-vestibular-and-ocular-motor-abnormalities-in-thiamine-deficiency
#17
REVIEW
Jorge C Kattah
PURPOSE: The first aim of this review is to summarize recent ocular motor signs in pre-encephalopathy patients with nutritional deficiency at risk of thiamine deficiency. Timely recognition of thiamine depletion in these patients, who may have a normal brain MRI, could lead to appropriate management and prevention of Wernicke's encephalopathy (WE) with full recovery. The second aim is to incorporate recent diagnostic testing on the revised WE diagnostic criteria and the identification of patients who may show slow, partial, or no response to treatment...
May 2017: Current Neurology and Neuroscience Reports
https://www.readbyqxmd.com/read/28328939/multimodal-mr-imaging-reveals-large-scale-structural-and-functional-connectivity-changes-in-profound-early-blindness
#18
Corinna M Bauer, Gabriella V Hirsch, Lauren Zajac, Bang-Bon Koo, Olivier Collignon, Lotfi B Merabet
In the setting of profound ocular blindness, numerous lines of evidence demonstrate the existence of dramatic anatomical and functional changes within the brain. However, previous studies based on a variety of distinct measures have often provided inconsistent findings. To help reconcile this issue, we used a multimodal magnetic resonance (MR)-based imaging approach to provide complementary structural and functional information regarding this neuroplastic reorganization. This included gray matter structural morphometry, high angular resolution diffusion imaging (HARDI) of white matter connectivity and integrity, and resting state functional connectivity MRI (rsfcMRI) analysis...
2017: PloS One
https://www.readbyqxmd.com/read/28325621/-diplopia-an-important-symptom-in-internal-medicine
#19
S Bidot, V Biousse
Diplopia is defined as "double vision" when looking at a single object. Monocular diplopia is related to an ocular disorder and must be differentiated from binocular diplopia which is secondary to ocular misalignment. The examination of the patient with binocular diplopia is often challenging for non-specialists. However, a careful and systematic clinical examination followed by targeted ancillary testing allows the clinician to localize the lesion along the oculomotor pathways. The lesion may involve the brainstem, the ocular motor nerves III, IV or VI, the neuromuscular junction, the extraocular ocular muscles, or the orbit...
March 18, 2017: La Revue de Médecine Interne
https://www.readbyqxmd.com/read/28315806/paroxysmal-nonepileptic-events-in-children-with-epilepsy
#20
Yuji Ito, Hiroyuki Kidokoro, Tamiko Negoro, Masaharu Tanaka, Yu Okai, Yoko Sakaguchi, Chikako Ogawa, Tomoya Takeuchi, Atsuko Ohno, Hiroyuki Yamamoto, Tomohiko Nakata, Satoshi Maesawa, Kazuyoshi Watanabe, Yoshiyuki Takahashi, Jun Natsume
OBJECTIVE: The aim of this study was to clarify the characteristics of paroxysmal nonepileptic events (PNEs) suspected as being epileptic seizures by families of children with epilepsy. METHODS: The video-EEG (vEEG) recordings of habitual paroxysmal events in children with epilepsy at Nagoya University Hospital between October 2006 and January 2016 were reviewed. Based on the doctor's suspicion before the vEEG, the PNEs were divided into two groups that included PNEs suspected as epileptic seizures and PNEs suspected as PNEs...
February 27, 2017: Epilepsy Research
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