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Related Concept Videos

Open Angle Glaucoma: Treatment01:27

Open Angle Glaucoma: Treatment

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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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Glaucoma: Overview01:25

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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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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, 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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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...
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Prosopagnosia, also known as face blindness, is the inability to recognize faces. In severe cases, individuals with prosopagnosia may not recognize close family members, including parents and spouses, by their faces. For instance, someone with prosopagnosia might walk past their child in a crowd, only realizing their mistake upon noticing their child's distinctive backpack or favorite jacket. Prosopagnosia specifically impairs facial recognition, while the recognition of other objects or...
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Related Experiment Video

Updated: Aug 9, 2025

Assessing Early Stage Open-Angle Glaucoma in Patients by Isolated-Check Visual Evoked Potential
07:11

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Progressive external ophthalmoplegia.

Michio Hirano1, Robert D S Pitceathly2

  • 1H. Houston Merritt Neuromuscular Research Center, Neuromuscular Medicine Division, Department of Neurology, Columbia University Irving Medical Center, New York, NY, United States.

Handbook of Clinical Neurology
|February 22, 2023
PubMed
Summary
This summary is machine-generated.

Progressive external ophthalmoplegia (PEO) has diverse genetic causes, including mitochondrial DNA and nuclear gene variants. Research reveals these genetic factors often disrupt mitochondrial genome maintenance, leading to PEO.

Keywords:
Kearns–Sayre syndromeMNGIEMitochondriaMitochondrial DNAOphthalmoplegiaSANDO

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Area of Science:

  • Genetics
  • Ophthalmology
  • Neurology

Background:

  • Progressive external ophthalmoplegia (PEO) is a clinical syndrome defined by ptosis and impaired eye movements.
  • The etiological landscape of PEO is expanding due to advances in molecular genetics.
  • Historically, PEO was linked to mitochondrial DNA (mtDNA) deletions in Kearns-Sayre syndrome.

Conclusions:

  • PEO is a genetically heterogeneous disorder with both mitochondrial and non-mitochondrial causes.
  • Genetic defects, particularly in nuclear genes, frequently disrupt mitochondrial DNA integrity.
  • Understanding these genetic underpinnings is crucial for diagnosing and potentially treating PEO subtypes.