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Related Concept Videos

Angle Closure Glaucoma: Treatment01:28

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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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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Ophthalmic Drug Delivery Systems

Ophthalmic drug delivery faces major limitations due to poor absorption across the corneal membrane. This process is primarily driven by diffusion and is influenced by two main factors: the physicochemical properties of the drug and tear drainage. Most ophthalmic drugs, such as pilocarpine, epinephrine, atropine, and local anesthetics, are weak bases. They are typically formulated at an acidic pH to enhance chemical stability. However, this leads to high ionization, reducing their ability to...
Open Angle Glaucoma: Treatment01:27

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.
Drugs such as carbonic anhydrase inhibitors, α2- and...

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Updated: Jun 5, 2026

Laser-Induced Chronic Ocular Hypertension Model on SD Rats
06:34

Laser-Induced Chronic Ocular Hypertension Model on SD Rats

Published on: December 4, 2007

Lasers in ophthalmology.

W Rock

    Canadian Family Physician Medecin De Famille Canadien
    |January 27, 2011
    PubMed
    Summary
    This summary is machine-generated.

    Ophthalmic lasers use focused light energy for two effects: thermal lesions (photocoagulation) or non-thermal disruption. Tissue absorbers like melanin and hemoglobin determine the laser wavelength for effective ocular treatments.

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    Area of Science:

    • Ophthalmology
    • Biomedical Optics
    • Laser Physics

    Background:

    • Lasers offer focused light energy for precise applications in the eye.
    • Ocular laser treatments utilize either thermal or non-thermal effects.
    • Understanding tissue light absorption is crucial for selecting appropriate laser wavelengths.

    Purpose of the Study:

    • To elucidate the two primary mechanisms of laser interaction with ocular tissues.
    • To identify key ocular chromophores influencing laser absorption.
    • To differentiate laser applications based on thermal and non-thermal effects.

    Main Methods:

    • Review of laser-tissue interaction principles.
    • Analysis of ocular chromophores (melanin, hemoglobin, xanthophyll) and their absorption spectra.
    • Categorization of laser effects based on energy delivery (thermal vs. non-thermal).

    Main Results:

    • Lasers can induce thermal lesions (photocoagulation) or non-thermal disruption.
    • Melanin and hemoglobin are primary absorbers in the anterior segment.
    • Hemoglobin and xanthophyll are key absorbers in the retina.
    • High-powered, short-duration lasers (e.g., Q-switched neodymium YAG) cause non-thermal effects.

    Conclusions:

    • Laser wavelength selection for photocoagulation depends on target tissue absorption characteristics.
    • Non-thermal laser effects can disrupt both transparent and opaque ocular tissues.
    • Lasers provide versatile tools for ophthalmic interventions through distinct thermal and non-thermal mechanisms.