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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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Doppler Optical Coherence Tomography of Retinal Circulation
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Glaucoma Increases Retinal Surface Contour Variability as Measured by Optical Coherence Tomography.

Ou Tan, Liang Liu, Xinbo Zhang

    Investigative Ophthalmology & Visual Science
    |July 14, 2016
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    Summary

    Retinal surface contour variability (RSCV) shows increased detection accuracy for early glaucoma, matching nerve fiber layer thickness. RSCV and NFLT offer complementary diagnostic information for glaucoma detection.

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    Area of Science:

    • Ophthalmology
    • Medical Imaging
    • Biomedical Engineering

    Background:

    • Glaucoma is a leading cause of irreversible blindness.
    • Early detection is crucial for preserving vision.
    • Current diagnostic methods like nerve fiber layer thickness (NFLT) have limitations in detecting subtle, early-stage damage.

    Purpose of the Study:

    • To investigate the feasibility of using retinal surface contour variability (RSCV) measured by optical coherence tomography (OCT) for glaucoma detection.
    • To compare the diagnostic performance of RSCV with NFLT in distinguishing glaucoma from healthy eyes.

    Main Methods:

    • Swept-source OCT was used to scan the peripapillary region (8x8 mm) of 17 glaucomatous and 17 healthy eyes.
    • Retinal surface contour was analyzed using Fourier transform to calculate RSCV within specific spatial frequency bands.
    • NFLT was measured, and glaucoma severity was assessed using automated static perimetry.

    Main Results:

    • RSCV was significantly higher in glaucoma eyes compared to control eyes (P < 0.003).
    • RSCV achieved an area under the receiver operating characteristic curve (AROC) of 0.90 at a 3.5-mm radius, comparable to NFLT (AROC = 0.84).
    • At 99% specificity, RSCV sensitivity was 53% versus 29% for NFLT, indicating better detection of early glaucoma.

    Conclusions:

    • RSCV is a promising biomarker for detecting glaucoma, particularly in early stages.
    • RSCV and NFLT provide complementary information, with RSCV detecting focal damage and NFLT measuring global damage.
    • Combining RSCV and NFLT measurements may enhance glaucoma diagnostic accuracy and patient management.