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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

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.
Drugs such as carbonic anhydrase inhibitors, α2- and...
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Angle Closure Glaucoma: Treatment01:28

Angle Closure Glaucoma: Treatment

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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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Photoreceptors and Visual Pathways01:22

Photoreceptors and Visual Pathways

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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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Chronopharmacokinetics: Circadian Rhythms and Influence on Drug Response01:15

Chronopharmacokinetics: Circadian Rhythms and Influence on Drug Response

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Circadian rhythms are cyclic changes that are crucial in plasma drug concentrations. Various standard circadian parameters, including core body temperature, heart rate, and other cardiovascular factors, directly impact disease states and the therapeutic response to drug therapy.
The time of drug administration is an important factor to consider, as it can influence the toxic dose of a drug. For example, a study conducted by Prins et al. in 1997 examined the effects of the timing of...
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Accessory Structures of the Eye01:17

Accessory Structures of the Eye

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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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Related Experiment Video

Updated: May 7, 2025

Full-Circle Cauterization of Limbal Vascular Plexus for Surgically Induced Glaucoma in Rodents
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Circadian Disruption in Glaucoma: Causes, Consequences, and Countermeasures.

Denis Gubin1,2,3, Tatyana Malishevskaya4, Dietmar Weinert5

  • 1Department of Biology, Tyumen Medical University, 625023 Tyumen, Russia.

Frontiers in Bioscience (Landmark Edition)
|December 30, 2024
PubMed
Summary

Glaucoma damages retinal cells, disrupting the body's internal clock and sleep patterns. Restoring circadian health may aid glaucoma management by balancing light exposure and melatonin.

Keywords:
circadian disruptionglaucomalightlight therapymelatoninmetabolismmoodretinal ganglion cellssleep

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Area of Science:

  • Ophthalmology and chronobiology
  • Neuroscience and physiology

Background:

  • The eye, particularly intrinsically photosensitive retinal ganglion cells (ipRGCs), synchronizes the body's circadian rhythms via the suprachiasmatic nucleus (SCN).
  • Local circadian rhythms within the eye influence functions like photoreceptor sensitivity and intraocular fluid dynamics.

Purpose of the Study:

  • To explore the link between glaucoma and circadian rhythm disturbances.
  • To discuss the role of the eye in circadian regulation and how glaucoma impacts it.

Main Methods:

  • Review of existing literature on glaucoma, circadian rhythms, and the eye's role in light transduction.
  • Discussion of optical coherence tomography (OCT) for assessing retinal ganglion cell (RGC) damage.

Main Results:

  • Glaucomatous retinal damage, caused by oxidative stress and neuroinflammation, disrupts both central and local circadian rhythms.
  • Circadian disruption negatively affects sleep, mood, and metabolism, with potential implications for glaucoma progression.

Conclusions:

  • Glaucoma-induced circadian disruption requires further investigation into underlying mechanisms.
  • Strategies to improve circadian health, including light management and chronotherapy, may offer new avenues for glaucoma treatment.