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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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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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Normal Stress01:19

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Normal stress is a type of stress that occurs when forces act perpendicular, or normal, to a material's cross-sectional area. This stress often arises in structures when subjected to axial loading, which is the application of force along the axis of an object. A practical example of this can be found in bridge truss members.
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Hypertension I: Introduction01:28

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Hypertension is a widespread, long-term medical condition where blood pressure in the arteries remains elevated. It is characterized by systolic blood pressure readings of 130 mm Hg or above or diastolic blood pressure (DBP) readings of 80 mm Hg or higher. Unmanaged hypertension poses significant health risks, making the distinction between primary (or essential) hypertension and secondary hypertension crucial, as their management and implications vary.Primary HypertensionPrimary hypertension,...
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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: Jan 19, 2026

Laser Capture Microdissection of Highly Pure Trabecular Meshwork from Mouse Eyes for Gene Expression Analysis
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Normal tension vs high tension glaucoma: an - overview.

J Lešták, Š Pitrová, E Nutterová

    Ceska a Slovenska Oftalmologie : Casopis Ceske Oftalmologicke Spolecnosti a Slovenske Oftalmologicke Spolecnosti
    |September 21, 2019
    PubMed
    Summary
    This summary is machine-generated.

    High tension glaucoma (HTG) damages retinal cells and visual pathways due to high intraocular pressure. Normal tension glaucoma (NTG) involves axonal damage and likely ischemia, with brain activity and structure differences observed.

    Keywords:
    differences from high tension glaucomasnormal tension glaucomastructural and functional changes

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    Area of Science:

    • Ophthalmology
    • Neurology

    Background:

    • Glaucoma encompasses conditions like high tension glaucoma (HTG) and normal tension glaucoma (NTG).
    • Understanding the distinct pathogenesis and neuroimaging differences between HTG and NTG is crucial for diagnosis and treatment.
    • Previous research highlights varying impacts on the visual pathway and brain activity.

    Purpose of the Study:

    • To provide an updated overview of the pathogenesis and structural/functional changes in NTG compared to HTG.
    • To elucidate less-known differences between these two glaucoma diagnostic groups.
    • To investigate potential links between cerebrospinal fluid dynamics, cerebral perfusion, and glaucoma progression.

    Main Methods:

    • Electrophysiological testing to assess visual pathway function.
    • Functional magnetic resonance imaging (fMRI) to evaluate brain activity patterns.
    • Measurement of central corneal thickness (CCT), optic nerve parameters (OND, OSD), and optic chiasma width.
    • Assessment of cerebral atrophy using bicaudate ratio (BCR) and white matter lesions via Fazekas scale.

    Main Results:

    • HTG shows pathology in the complete visual pathway with reduced brain activity, while NTG has relatively normal retinal ganglion cell response but visual pathway abnormalities.
    • No significant difference in CCT between groups, but CCT affects visual field progression in HTG.
    • NTG exhibits a lower optic chiasma width compared to healthy individuals; BCR correlates with visual field defects, indicating brain atrophy in glaucoma.
    • Fazekas scale revealed significant differences among NTG, HTG, and controls, with HTG showing the most advanced changes.

    Conclusions:

    • HTG leads to retinal ganglion cell and visual cortex impairment due to elevated intraocular pressure.
    • NTG involves axonal alterations, with retinal ganglion cells and visual cortex relatively spared, likely caused by ischemia rather than high intraocular pressure.
    • Distinct neuroimaging and electrophysiological findings differentiate HTG and NTG, suggesting different underlying pathologies.