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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.
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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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Focusing of Light in the Eye01:16

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Light rays enter the eye through the cornea, a transparent dome-shaped tissue that is the eye's outermost layer. The cornea bends or refracts, light rays traveling to the pupil. The shape of the cornea determines how much of the light is bent and whether the image will be focused correctly on the retina at the back of the eye. Once the light has passed through both refraction layers, it converges into a single focal point onto a small area. This is where photoreceptors start transforming...
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As individuals age, their body's physiology evolves, affecting drug pharmacokinetics. The most apparent changes occur in the gastrointestinal tract, where an increase in gastric pH, a delay in gastric emptying, and a reduction in gastrointestinal motility are observed. Remarkably, these changes do not substantially modify the absorption of orally administered drugs, particularly those absorbed via passive diffusion.Transdermal drug delivery emerges as a highly viable method for older adults due...
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Related Experiment Video

Updated: Mar 31, 2026

Glaucoma-inducing Procedure in an In Vivo Rat Model and Whole-mount Retina Preparation
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Glaucoma-inducing Procedure in an In Vivo Rat Model and Whole-mount Retina Preparation

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Glaucomas.

Federica Maggio1

  • 1Tufts Veterinary Emergency Treatment and Specialties (Tufts V.E.T.S.), Walpole, MA, USA.

Topics in Companion Animal Medicine
|October 24, 2015
PubMed
Summary
This summary is machine-generated.

Canine and feline glaucoma, characterized by increased intraocular pressure (IOP), often leads to vision loss. While medical treatments offer temporary relief, surgical interventions are frequently necessary for long-term IOP management and vision preservation in pets.

Keywords:
catdogeyeglaucomamedical therapysurgical procedures

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Area of Science:

  • Veterinary Ophthalmology
  • Comparative Ophthalmology

Background:

  • Glaucoma in dogs and cats is a frequent ocular emergency causing vision loss.
  • Elevated intraocular pressure (IOP) is a primary risk factor, damaging the retina and optic nerve.

Purpose of the Study:

  • To review the diagnosis and treatment of canine and feline glaucoma.
  • To emphasize the importance of IOP management for vision preservation.

Main Methods:

  • Diagnosis involves IOP measurement, gonioscopy, and fundic examinations.
  • Treatment strategies include medical management for temporary IOP control and surgical interventions for long-term management.

Main Results:

  • Medical therapy alone is insufficient for sustained IOP control.
  • Surgical options aim to decrease IOP by reducing aqueous humor production or enhancing its drainage.

Conclusions:

  • Despite advances, blindness and pain remain common in advanced glaucoma.
  • End-stage treatments like enucleation or ciliary body ablation are options for chronic discomfort in blind eyes.