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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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Early Glaucoma Discrimination Index.

Hend Safwat1, Elaraby Nassar2, Afaf Rashwan1

  • 1Department of Ophthalmology, Faculty of Medicine for Girls, Al-Azhar University, Cairo, Egypt.

Journal of Current Glaucoma Practice
|June 26, 2020
PubMed
Summary
This summary is machine-generated.

A new algorithm using optical coherence tomography (OCT) data effectively identifies early glaucoma. This early glaucoma discrimination index (EGDI) aids in diagnosing glaucoma before vision loss occurs.

Keywords:
GlaucomaOptical coherence tomographyRetinal nerve fiber layer

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Area of Science:

  • Ophthalmology
  • Medical Imaging
  • Glaucoma Research

Background:

  • Primary open-angle glaucoma (POAG) is a leading cause of irreversible blindness.
  • Early detection of POAG is crucial for timely intervention and vision preservation.
  • Current diagnostic methods may have limitations in identifying very early-stage glaucoma.

Purpose of the Study:

  • To develop and validate a novel structural algorithm using optical coherence tomography (OCT) parameters.
  • To assess the algorithm's ability to discriminate between normal, suspect, and early primary open-angle glaucoma (POAG) eyes.
  • To evaluate the algorithm's performance in diagnosing glaucoma in the pre-perimetric stage.

Main Methods:

  • A case-controlled observational study involving 150 subjects (299 eyes).
  • Data collected included circumpapillary retinal nerve fiber layer (cpRNFL) thickness and inter-eye asymmetry from spectral domain OCT (SD-OCT).
  • A binary logistic regression analysis was used to develop the Early Glaucoma Discrimination Index (EGDI).

Main Results:

  • The EGDI utilizes four key OCT parameters: whole cpRNFL thickness, inferior quadrant cpRNFL thickness, inferotemporal clock hour cpRNFL thickness, and absolute inter-eye inferior quadrants asymmetry.
  • The EGDI demonstrated a high area under the curve (AUC) of 0.854 for discriminating among normal, suspect, and early glaucoma groups.
  • Validation in the suspect group showed a superior diagnostic ability with an AUC of 0.989 for detecting early glaucoma.

Conclusions:

  • The developed EGDI exhibits significant diagnostic capability for identifying glaucoma in its pre-perimetric stage.
  • The algorithm is simple to implement on standard SD-OCT devices and does not require normative data.
  • This OCT-derived algorithm offers a promising tool for early glaucoma detection and management.