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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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Related Experiment Video

Updated: Feb 24, 2026

Assessing Early Stage Open-Angle Glaucoma in Patients by Isolated-Check Visual Evoked Potential
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Pattern noise (PANO): a new automated functional glaucoma test.

Sylvain El-Khoury1, Thomas Hannen2, Diana Carmen Dragnea2

  • 1Department of Ophthalmology, University Medical Centre Mainz, Langenbeckstraße 1, 55131, Mainz, Germany. sylvain_elkhoury@yahoo.com.

International Ophthalmology
|August 18, 2017
PubMed
Summary
This summary is machine-generated.

A new visual field device, pattern noise (PANO), effectively detects glaucoma defects. This cost-effective tool shows promise for widespread use in low-income regions, aiding early glaucoma diagnosis.

Keywords:
GlaucomaHealthcare researchVisual field

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Area of Science:

  • Ophthalmology
  • Medical Devices
  • Public Health

Background:

  • Glaucoma is a leading cause of blindness, particularly prevalent in low-income countries.
  • Existing visual field testing devices can be expensive and complex, limiting their accessibility in resource-limited settings.
  • There is a need for cost-effective, practical, and easily repairable visual field devices for glaucoma screening and diagnosis.

Purpose of the Study:

  • To introduce the pattern noise (PANO) visual field device, engineered for sensitivity to glaucoma defects.
  • To highlight PANO's design features: cost-effectiveness, material practicality, and ease of repair.
  • To assess PANO's suitability for low-income countries with high glaucoma prevalence, such as sub-Saharan Africa.

Main Methods:

  • A prospective matched case-control pilot study was conducted in Cameroon.
  • The PANO device utilizes flickering bright/dark pixels (5° size, 18 Hz) to measure contrast levels.
  • Twenty glaucoma patients and 20 age- and laterality-matched healthy controls were recruited for the study.

Main Results:

  • Glaucoma patients exhibited significantly higher mean contrast thresholds (16.2 ± 14.3) compared to healthy controls (4.4 ± 0.8).
  • A significant correlation was found between mean contrast thresholds and the cup-to-disc ratio (r = 0.59, P = 0.006).
  • Examination time was longer for glaucoma eyes (8.2 min) than healthy eyes (6.1 min), with no significant difference in error rates.

Conclusions:

  • The PANO device successfully identified visual field defects in patients with glaucomatous optic discs.
  • Detected defects showed a significant correlation with morphological alterations in the glaucomatous optic nerve head.
  • Further research is recommended to fully establish the clinical utility of the PANO device.