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Related Concept Videos

Accessory Structures of the Eye01:17

Accessory Structures of the Eye

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...
Muscles of the Eye01:20

Muscles of the Eye

The muscles of the eye are sophisticated structures that control eye movement and focus, allowing for the precise and rapid adjustments necessary for vision. The human eye is controlled by ten muscles — six extraocular muscles, three intraocular muscles, and one primary eyelid retractor muscle.
Extraocular Muscles
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Angle Closure Glaucoma: Treatment

Angle-closure glaucoma, or closed-angle glaucoma, is an eye condition where the iris bulges out and blocks the iridocorneal angle, resulting in a buildup of aqueous humor and increased intraocular pressure. Immediate medical attention is necessary due to the sudden onset of symptoms. The treatment for angle-closure glaucoma includes short-term and long-term approaches. Short-term treatment involves using eye drops like pilocarpine to lower intraocular pressure by increasing aqueous humor...
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Photoreceptors and Visual Pathways

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, whereas...
Glaucoma: Overview01:25

Glaucoma: Overview

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...
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Open Angle Glaucoma: Treatment

In open-angle glaucoma, the iridocorneal angle remains open, but the trabecular meshwork becomes stiff, slowing down the outflow of aqueous humor. This causes a buildup of aqueous humor in the anterior chamber, leading to a sudden increase in intraocular pressure. The treatment for open-angle glaucoma focuses on reducing the elevated intraocular pressure by either decreasing the secretion of aqueous humor or increasing its outflow.
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VisualEyes: A Modular Software System for Oculomotor Experimentation
10:41

VisualEyes: A Modular Software System for Oculomotor Experimentation

Published on: March 25, 2011

Eye movement control and its disorders.

Atchareeya Wiwatwongwana1, Christopher J Lyons

  • 1Department of Ophthalmology and Visual Sciences, University of British Columbia, Vancouver, Canada; Division of Pediatric Ophthalmology and Strabismus, Department of Ophthalmology, Chiang Mai University, Chiang Mai, Thailand.

Handbook of Clinical Neurology
|April 30, 2013
PubMed
Summary
This summary is machine-generated.

This review covers the brainstem's control of eye movements via cranial nerves III, IV, and VI. It details gaze abnormalities, clinical testing, and differential diagnoses for palsies and childhood neuromuscular disorders.

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Area of Science:

  • Neuroscience
  • Ophthalmology
  • Neurology

Background:

  • Understanding the supranuclear control of eye movements is crucial for diagnosing neurological disorders.
  • Cranial nerves III (oculomotor), IV (trochlear), and VI (abducens) are essential for coordinated eye movements.
  • Abnormalities in these pathways can lead to significant visual disturbances and neurological deficits.

Purpose of the Study:

  • To review the supranuclear control centers and pathways governing eye movements.
  • To discuss the clinical evaluation and differential diagnoses of cranial nerve palsies.
  • To explore childhood neuromuscular junction and muscle disorders affecting ocular motility.

Main Methods:

  • Review of neuroanatomical pathways controlling horizontal and vertical gaze.
  • Discussion of clinical examination techniques for cranial nerves III, IV, and VI.
  • Analysis of characteristic clinical features associated with specific lesion sites.

Main Results:

  • Detailed description of supranuclear gaze control and cranial nerve pathways.
  • Highlighting clinical findings that aid in localizing neurological lesions.
  • Summarizing differential diagnoses including Duane syndrome, Möbius syndrome, myasthenia gravis, CPEO, and thyroid orbitopathy.

Conclusions:

  • Accurate localization of neurological lesions is facilitated by understanding eye movement control.
  • Comprehensive evaluation of cranial nerve palsies requires knowledge of associated syndromes and disorders.
  • This review provides a framework for diagnosing complex pediatric and adult ocular motility disorders.