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Related Concept Videos

Open Angle Glaucoma: Treatment01:27

Open Angle Glaucoma: Treatment

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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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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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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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Optical perception, or vision, is an extraordinary sense dependent on converting light signals received via the ocular organs. These organs, known as eyes, are securely positioned within the bony cavities of the skull, called orbits. The orbits serve a dual purpose: a protective shield for the ocular globes and a stable attachment point for the soft ocular tissues. The eye's external protective mechanisms include the eyelids, which are edged with lashes that act as a barrier against foreign...
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Combining OCT and OCTA for Focal Structure-Function Modeling in Early Primary Open-Angle Glaucoma.

Damon Wong1,2,3, Jacqueline Chua3,4, Bingyao Tan1,2,3

  • 1SERI-NTU Advanced Ocular Engineering (STANCE), Singapore.

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Combining structural and vascular measurements improves modeling of visual field loss in early glaucoma. This approach offers better detection of defects in the superior nasal regions compared to methods using only structural or vascular data.

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Area of Science:

  • Ophthalmology
  • Medical Imaging
  • Glaucoma Research

Background:

  • Early primary open-angle glaucoma (POAG) is characterized by progressive visual field (VF) loss.
  • Accurate modeling of focal VF loss is crucial for timely intervention.
  • Current models may not fully capture the complex interplay of structural and vascular changes.

Purpose of the Study:

  • To investigate the effectiveness of combining structural and vascular measurements for modeling focal VF loss in early POAG.
  • To compare the performance of a combined approach with univariate models using only structural or vascular data.

Main Methods:

  • Cross-sectional study involving 97 eyes with early POAG.
  • Optical coherence tomography (OCT) for retinal nerve fiber layer (RNFL) thickness.
  • Optical coherence tomography angiography (OCTA) for capillary perfusion densities (CPDs) after large vessel removal.
  • Humphrey 24-2 VF tests and nerve fiber trajectory tracings.
  • Linear mixed models to associate focal VF loss with RNFL and CPD.

Main Results:

  • The combined RNFL-CPD model achieved a median adjusted R2 of 0.30, outperforming RNFL-only (0.22) and CPD-only (0.26) models.
  • Seventeen VF locations showed an adjusted R2 > 0.50 with the combined approach.
  • The combined model demonstrated significantly better performance in superior nasal VF regions.

Conclusions:

  • Integrating structural (RNFL) and vascular (CPD) parameters enhances the modeling of focal VF loss in early glaucoma.
  • This combined approach may improve the evaluation of VF defects by considering both OCT and OCTA characteristics.
  • The findings suggest a potential for improved diagnostic and monitoring tools in glaucoma management.