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Related Concept Videos

Glaucoma: Overview01:25

Glaucoma: Overview

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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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Open Angle Glaucoma: Treatment01:27

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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.
Drugs such as carbonic anhydrase inhibitors, α2- and...
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Blood Pressure Imbalances and Circulatory Shock01:24

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Disorders affecting blood volume, vascular tone, or vascular function can disrupt vascular homeostasis, including conditions like hypertension, hemorrhage, and shock.
Blood Pressure: Hypertension and Hypotension
Normal blood pressure is 120/80 mm Hg. Elevated blood pressure is 120-129/under 80 mm Hg. Hypertension, warranting treatment at 130/80 mm Hg, is often asymptomatic and can lead to severe cardiovascular events, aneurysms, peripheral arterial disease, chronic renal disease, or cardiac...
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Angle Closure Glaucoma: Treatment01:28

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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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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,...
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Related Experiment Video

Updated: Mar 20, 2026

The Rodent Model of Nonarteritic Anterior Ischemic Optic Neuropathy rNAION
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[Shock-induced ischemic optic neuropathy].

C H van Herpen1, W A C Koekkoek, R S Ramrattan

  • 1Ziekenhuis Gelderse Vallei, afd. Intensive Care, Ede.

Nederlands Tijdschrift Voor Geneeskunde
|May 28, 2016
PubMed
Summary

Septic shock can cause irreversible blindness due to ischemic optic neuropathy. Early recognition of this severe complication is crucial for patient care and rehabilitation.

Area of Science:

  • Ophthalmology
  • Critical Care Medicine
  • Neurology

Background:

  • Shock, a life-threatening condition, can impair blood flow to vital organs.
  • Ischemic optic neuropathy (ION) is a potential complication of shock, which can lead to vision loss.

Observation:

  • A 61-year-old female patient developed severe vision impairment after septic shock.
  • Ophthalmologic evaluation revealed bilateral, atrophic optic discs and sluggish pupillary reflexes.
  • The patient was diagnosed with shock-induced ischemic optic neuropathy and remained permanently blind.

Findings:

  • Shock-induced ION is a rare but devastating complication of critical illness.
  • This condition often results in irreversible vision loss.

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Rat Model of Photochemically-Induced Posterior Ischemic Optic Neuropathy
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Author Spotlight: Developing Precise and Clinically Relevant Models for Studying Secondary Degeneration in Traumatic Optic Neuropathy
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Implications:

  • Early detection of ION in shock patients is vital for appropriate patient management.
  • Recognizing blindness promptly can prevent patient trauma and aid in rehabilitation efforts.