Control systems analysis is proposed as a method for understanding the pathophysiology of oculomotor imbalance, thereby permitting better differential diagnosis and more specific treatment. Clinical cases of nonstrabismic divergent deviations, with an emphasis on convergence insufficiency (CI) are presented and explained using conventional optometric diagnostic concepts and fixation disparity (FD) curves with control systems analysis as the central, unifying concept.
Download full-text PDF |
Source |
|---|---|
| http://dx.doi.org/10.1097/00006324-198806000-00003 | DOI Listing |
Publication Analysis
Top Keywords
Similar Publications
Delayed Progression of Ataxia with a Static Cerebellar Lesion- Consider SCA27B.
Cerebellum
January 2025
Department of Neurology, Donders Institute for Brain, Cognition & Behaviour, Radboud University Medical Center, Nijmegen, The Netherlands.
Repeat expansions in the fibroblast growth factor 14 gene (FGF14), associated with spinocerebellar ataxia type 27B (SCA27B), have emerged as a prevalent cause of previously unexplained late-onset cerebellar ataxia. Here, we present a patient with residual symptom of gait ataxia after complicated meningioma surgery, who presented with progressive symptoms of oculomotor disturbances, speech difficulties, vertigo and worsening of gait imbalance, twelve years post-resection. Neuroimaging revealed a surgical resection cavity in the dorsolateral side of the left cerebellar hemisphere, accompanied by gliosis in left cerebellar hemisphere extending into the vermis, extensive non-specific supratentorial periventricular white matter abnormalities, and mild atrophy of the cerebellar vermis.
View Article and Find Full Text PDFExploring Treatments for a Rare Guillain-Barré Variant: A Case Report of Miller-Fisher Syndrome.
Cureus
July 2024
Internal Medicine, Dr. D. Y. Patil Medical College, Hospital and Research Centre, Dr. D. Y. Patil Vidyapeeth, Pune (Deemed to be University), Pune, IND.
The symptoms of Miller-Fisher syndrome (MFS) are a triad of areflexia, ataxia, and ophthalmoplegia. The condition is a rare variant of Guillain-Barré syndrome (GBS), an acute immune-mediated nerve disorder. Both conditions involve abnormal autoimmune responses that may often be triggered by infections such as , human immunodeficiency virus, Epstein-Barr virus, and Zika virus, among others.
View Article and Find Full Text PDFBinocular Visual Deficits at Low to High Spatial Frequency in Intermittent Exotropia After Surgery.
Invest Ophthalmol Vis Sci
August 2024
National Engineering Research Center of Ophthalmology and Optometry, Eye Hospital Wenzhou Medical University, Wenzhou, China.
Purpose: To investigate binocular visual deficits at low to high spatial frequencies in patients with intermittent exotropia (IXT) after surgical correction, using the binocular orientation combination task.
Methods: Thirteen patients whose IXT has been aligned surgically (17 ± 4.8 years old; 7 females) and 13 normal individuals (21.
Physical Therapy and Aminopyridine for Downbeat Nystagmus Syndrome: A Case Report.
J Neurol Phys Ther
June 2024
Author Affiliations: MGH Institute of Health Professions, Boston, MA and Department of Physical Therapy, Spaulding Rehabilitation Hospital, Boston, MA (E.C.); and Department of Neurology, Massachusetts General Hospital and Harvard Medical School, Ataxia Center, Cognitive Behavioral Neurology Unit, Laboratory for Neuroanatomy and Cerebellar Neurobiology, Boston, MA (J.D.S.).
Background And Purpose: Individuals with downbeat nystagmus (DBN) syndrome present with DBN, dizziness, blurred vision, and unsteady gait. Pharmacological intervention with 4-aminopyridine (4-AP) may be effective in improving oculomotor function, but there is minimal evidence to date that it improves gait. This suggests the possible benefit of combining pharmacotherapy with physical therapy to maximize outcomes.
View Article and Find Full Text PDFCentral Vestibular Dysfunction in Head Injury.
J Otolaryngol Head Neck Surg
June 2024
Division of Otology/Neurotology, Department of Otolaryngology-Head and Neck Surgery, Toronto General Hospital, University Health Network, Toronto, ON, Canada.
Article Synopsis
- This study investigates dizziness in individuals who have suffered head injuries and differentiates between those with central vestibular dysfunction (CVD) and those with post-traumatic peripheral vestibular issues.
- The research retrospectively analyzed data from a neurotology database covering head-injured workers, including detailed medical histories, audiovestibular tests, and imaging studies.
- Results showed that while CVD is rare, it often involves significant symptoms like persistent imbalance and eye movement abnormalities, suggesting more severe brain injuries, which were not always detectable on scans.
Want AI Summaries of new PubMed Abstracts delivered to your In-box?
Enter search terms and have AI summaries delivered each week - change queries or unsubscribe any time!