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Related Concept Videos

Glaucoma: Overview01:25

Glaucoma: Overview

652
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...
652
Open Angle Glaucoma: Treatment01:27

Open Angle Glaucoma: Treatment

504
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...
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Angle Closure Glaucoma: Treatment01:28

Angle Closure Glaucoma: Treatment

589
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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Related Experiment Video

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Assessing Early Stage Open-Angle Glaucoma in Patients by Isolated-Check Visual Evoked Potential
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Frequency of Visual Fields Needed to Detect Glaucoma Progression: A Computer Simulation Using Linear Mixed Effects

Samaneh Sabouri1, Elham Haem1, Masoumeh Masoumpour2

  • 1Department of Biostatistics.

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|April 13, 2023
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Summary

Optimizing glaucoma monitoring, irregular visual field testing schedules with shorter initial intervals and longer later intervals effectively detect disease progression. This approach balances timely detection with cost-efficiency in glaucoma patient care.

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Area of Science:

  • Ophthalmology
  • Medical Statistics

Background:

  • Glaucoma management requires balancing visual field test frequency with long-term costs.
  • Insufficient treatment due to delayed detection can negatively impact glaucoma patients.

Purpose of the Study:

  • To determine the optimal follow-up scheme for timely glaucoma progression detection.
  • To simulate real-world visual field data using a linear mixed-effects model (LMM).

Main Methods:

  • An LMM with random intercept and slope simulated mean deviation sensitivities over time.
  • Data from 277 glaucoma eyes (9.0±1.2 years follow-up) were used to derive residuals.
  • 10,000 series of eyes were simulated across various follow-up scenarios and progression rates.

Main Results:

  • An irregular testing schedule with initially short and later longer intervals showed acceptable glaucoma progression detection.
  • A 4-monthly testing schedule detected progression faster, especially within the first two years.
  • Twice-yearly testing yielded similar results to thrice-yearly testing after the initial period.

Conclusions:

  • Irregular visual field testing, with adjusted intervals based on disease stage, is effective for glaucoma monitoring.
  • Simulating data with LMM can improve estimates of glaucoma progression time.
  • This strategy offers a potential improvement for glaucoma patient monitoring and management.