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Related Concept Videos

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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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, 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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Characterizing and quantifying the temporal relationship between structural and functional change in glaucoma.

Fang-I Chu1,2, Lyne Racette1,3

  • 1Eugene and Marilyn Glick Eye Institute, Indiana University, Indianapolis, IN, United States of America.

Plos One
|April 1, 2021
PubMed
Summary
This summary is machine-generated.

The relationship between structural and functional changes in glaucoma varies by patient. Analyzing the structure-function (SF) relationship at an individual level is crucial for accurate glaucoma progression modeling.

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Area of Science:

  • Ophthalmology
  • Neuroscience
  • Medical Imaging

Background:

  • Glaucoma is a progressive optic neuropathy characterized by structural damage and functional vision loss.
  • Understanding the temporal relationship between structural and functional changes is key to monitoring disease progression.

Purpose of the Study:

  • To characterize and quantify the temporal relationship between structural (rim area) and functional (mean sensitivity) changes in glaucoma patients.
  • To investigate if structural changes precede, follow, or occur simultaneously with functional changes.

Main Methods:

  • 120 patients with ocular hypertension or primary open-angle glaucoma were followed for 5-10 years with 11 visits.
  • Rim area (RA) and mean sensitivity (MS) were measured at each visit.
  • Cross-correlation functions (CCFs) and lagging regression analysis were used to assess the structure-function (SF) relationship and temporal lags.

Main Results:

  • The strongest structure-function (SF) correlation varied across patients, with different temporal lags (simultaneous, structure preceding function, or function preceding structure).
  • Lagging regression analysis revealed significant differences in the visit lag relationship within these patient groups (p<0.0001).

Conclusions:

  • The temporal relationship between structure and function in glaucoma is patient-specific.
  • Jointly modeling glaucoma progression requires addressing the structure-function (SF) relationship at the individual subject level.