Ocular motor abnormalities in neurodegenerative disorders
1Nuffield Department of Clinical Neurosciences, University of Oxford, Oxford UK.
Eye (London, England)
|November 22, 2014
Summary
Abnormalities in eye movements, crucial for gaze control and visual tracking, can signal neurological diseases. This review examines major ocular motor deficits in neurodegenerative disorders.
Area of Science:
- Ophthalmology
- Neuroscience
- Neurology
Background:
- Eye movements provide critical diagnostic information for clinicians and researchers.
- Ocular motor abnormalities often indicate specific disease locations within the nervous system.
Purpose of the Study:
- To review significant ocular motor abnormalities observed in patients with neurodegenerative disorders.
- To highlight the diagnostic value of eye movement analysis in neurology.
Main Methods:
- Review of scientific literature on neurodegenerative diseases and ocular motor function.
- Classification of eye movements into gaze-holding (e.g., vestibulo-ocular reflex) and gaze-shifting (e.g., saccades).
Main Results:
- Discussion of major ocular motor abnormalities associated with various neurodegenerative conditions.
- Emphasis on how specific eye movement deficits correlate with disease localization.
Conclusions:
- Ocular motor abnormalities are key indicators in the diagnosis and localization of neurodegenerative diseases.
- Understanding these abnormalities aids in clinical assessment and scientific research.
More Related Videos
Related Concept Videos
Accessory Structures of the Eye
4.8K
Optical perception, or vision, is an extraordinary sense dependent on converting light signals received via the ocular organs. These organs, known as eyes, are securely positioned within the bony cavities of the skull, called orbits. The orbits serve a dual purpose: a protective shield for the ocular globes and a stable attachment point for the soft ocular tissues. The eye's external protective mechanisms include the eyelids, which are edged with lashes that act as a barrier against foreign...
4.8K
Photoreceptors and Visual Pathways
11.3K
At the molecular level, visual signals trigger transformations in photopigment molecules, resulting in changes in the photoreceptor cell's membrane potential. The photon's energy level is denoted by its wavelength, with each specific wavelength of visible light associated with a distinct color. The spectral range of visible light, classified as electromagnetic radiation, spans from 380 to 720 nm. Electromagnetic radiation wavelengths exceeding 720 nm fall under the infrared category,...
11.3K
Glaucoma: Overview
1.7K
Glaucoma is an eye condition characterized by increased intraocular pressure that damages the retina and optic nerve, leading to irreversible blindness if left untreated. The human eye has various components, including the cornea, iris, pupil, lens, and optic nerve. Aqueous humor is secreted by the epithelium of the ciliary body in the posterior chamber and flows through the trabecular meshwork and canal of Schlemm, maintaining normal intraocular pressure. The trabecular meshwork and the canal...
1.7K
Parkinson's Disease: Overview
2.5K
Neurodegenerative disorders are progressive diseases that cause irreversible damage and loss to neurons in specific brain areas. Examples of these disorders include Parkinson's disease, Alzheimer's disease, Multiple Sclerosis (MS), and Amyotrophic Lateral Sclerosis (ALS). These disorders share characteristics such as proteinopathies, selective neuronal vulnerability, and a complex interplay between genetic and environmental factors. The primary therapeutic goal for these conditions is...
2.5K
Parkinson Disease ll: Pathophysiology
11
Parkinson disease (PD) is a progressive neurodegenerative disorder primarily affecting movement, with additional non-motor features. Its pathophysiology involves complex interactions among genetic susceptibility, environmental exposures, and cellular dysfunction, including dopaminergic neuron loss, protein aggregation, and mitochondrial impairment.Selective NeurodegenerationA key feature is the degeneration of dopaminergic neurons in the substantia nigra pars compacta, leading to reduced...
11
Alterations in Muscle Tone ll
2
Alterations in muscle tone are common manifestations of neurological disorders and reflect dysfunction within different nervous system regions. Spasticity, paratonia, and dystonia represent distinct forms of hypertonia, each with unique mechanisms, clinical features, and diagnostic importance.CharacteristicsSpasticity happens from upper motor neuron lesions and is characterized by velocity-dependent resistance to passive movement. Clinical features include:Exaggerated deep tendon reflexesClonus...
2


