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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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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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Hypertension is asymptomatic and also referred to as the "silent killer" until it progresses to a severe stage or causes target organ disease. Patients may experience symptoms stemming from the strain on blood vessels and tissues in various organs or the heart's increased workload.Physical exams might show no abnormalities other than high blood pressure. Signs of vascular damage, when present, correspond to the organs supplied by the affected vessels, leading to target organ damage. For...
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Updated: Nov 12, 2025

Assessing Early Stage Open-Angle Glaucoma in Patients by Isolated-Check Visual Evoked Potential
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VISUAL FIELD ASSESSMENT IN HYPERTENSION GLAUCOMA.

J Lešták, M Fůs

    Ceska a Slovenska Oftalmologie : Casopis Ceske Oftalmologicke Spolecnosti a Slovenske Oftalmologicke Spolecnosti
    |March 20, 2021
    PubMed
    Summary
    This summary is machine-generated.

    This study found that a glaucoma perimetry test is sufficient for diagnosing incipient glaucoma, even in early stages. Full-field perimetry may not be necessary for documenting disease progression in these patients.

    Keywords:
    brimonidinhypertension glaucomaoverall defektpattern defectperimetry test

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    Area of Science:

    • Ophthalmology
    • Medical Diagnostics

    Background:

    • Glaucoma is a progressive optic neuropathy often characterized by visual field loss.
    • Early detection and monitoring are crucial for managing glaucoma and preventing vision impairment.

    Purpose of the Study:

    • To evaluate the necessity of full-field perimetry in diagnosing incipient glaucoma.
    • To compare the effectiveness of full-field perimetry versus glaucoma perimetry in detecting early visual field defects.

    Main Methods:

    • A study involving 16 patients with incipient hypertension glaucoma (HTG) and 10 healthy controls.
    • Both groups underwent full-field perimetry and glaucoma perimetry (rapid threshold strategy).
    • Pattern defect (PD) and overall defect (OD) were analyzed using Pearson's correlation coefficient.

    Main Results:

    • Strong correlations were observed between both perimetry tests for PD and OD in the HTG group (r=0.74 for PD, r=0.63 for OD).
    • Moderate to strong correlations were found in the control group (r=0.54 for PD, r=0.64 for OD).
    • Contrary to expectations, peripheral visual field changes were not detected earlier in the HTG group with full-field perimetry.

    Conclusions:

    • Glaucoma perimetry alone is sufficient for documenting the course and progression of incipient glaucoma.
    • Full-field perimetry may not be essential for managing early-stage glaucoma patients.
    • These findings support the use of targeted glaucoma perimetry for efficient diagnosis and monitoring.