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Related Concept Videos

Glaucoma: Overview01:25

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...
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...
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...
Photoreceptors and Visual Pathways01:22

Photoreceptors and Visual Pathways

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, whereas...

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Related Experiment Video

Updated: May 10, 2026

Functional Magnetic Resonance Imaging (fMRI) of the Visual Cortex with Wide-View Retinotopic Stimulation
07:11

Functional Magnetic Resonance Imaging (fMRI) of the Visual Cortex with Wide-View Retinotopic Stimulation

Published on: December 8, 2023

Glaucoma classification based on visual pathway analysis using diffusion tensor imaging.

Ahmed El-Rafei1, Tobias Engelhorn, Simone Wärntges

  • 1Pattern Recognition Lab, Department of Computer Science, Friedrich-Alexander-University Erlangen-Nuremberg, Erlangen, Germany. ahmed.el-rafei@informatik.uni-erlangen.de

Magnetic Resonance Imaging
|June 12, 2013
PubMed
Summary

This study introduces a novel glaucoma diagnosis system analyzing brain

Keywords:
ClassificationDTIDiffusion Tensor ImagingDiffusion tensor imagingGlaucomaNTGNormal Tension GlaucomaOptic radiationPOAGPrimary Open Angle GlaucomaTexture featuresVisual pathway

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DTI of the Visual Pathway - White Matter Tracts and Cerebral Lesions
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Measuring Connectivity in the Primary Visual Pathway in Human Albinism Using Diffusion Tensor Imaging and Tractography
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Measuring Connectivity in the Primary Visual Pathway in Human Albinism Using Diffusion Tensor Imaging and Tractography

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Related Experiment Videos

Last Updated: May 10, 2026

Functional Magnetic Resonance Imaging (fMRI) of the Visual Cortex with Wide-View Retinotopic Stimulation
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Published on: December 8, 2023

DTI of the Visual Pathway - White Matter Tracts and Cerebral Lesions
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13:26

Measuring Connectivity in the Primary Visual Pathway in Human Albinism Using Diffusion Tensor Imaging and Tractography

Published on: August 11, 2016

Area of Science:

  • Neuroimaging
  • Ophthalmology
  • Medical Diagnostics

Background:

  • Glaucoma diagnosis traditionally focuses on the retina, overlooking the affected visual pathway in the brain.
  • Diffusion Tensor Imaging (DTI) advances neuroimaging, enabling white matter fiber characterization.

Purpose of the Study:

  • To develop and validate a system for glaucoma detection and differentiation using DTI analysis of visual pathway fibers.
  • To investigate the efficacy of analyzing the optic radiation for improved glaucoma diagnosis.

Main Methods:

  • Semi-automatic identification of the optic radiation for DTI analysis.
  • Extraction of Histogram, co-occurrence matrices, and Laws features from DTI-derived measures.
  • Support Vector Machine (SVM) classification with 10-fold cross-validation.

Main Results:

  • High discrimination accuracy between healthy and glaucoma subjects (94.1%).
  • Accurate classification of healthy vs. primary open-angle glaucoma (92.4%) and healthy vs. normal-tension glaucoma (100%).
  • Excellent differentiation between glaucoma subtypes (POAG and NTG) with 98.3% accuracy.

Conclusions:

  • DTI analysis of the visual pathway offers a promising, high-performance alternative to retina-based glaucoma detection.
  • This approach represents a new trend in glaucoma diagnosis by analyzing the entire visual system.
  • The findings suggest improved glaucoma examination and treatment through comprehensive visual system analysis.