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Choroidal Microvascular Dropout in Primary Angle Closure Glaucoma.

Harsha L Rao1, Shruthi Sreenivasaiah2, Mohammed Riyazuddin3

  • 1Narayana Nethralaya, Rajajinagar, Bangalore, India; Narayana Nethralaya, Hulimavu, Bangalore, India.

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Summary
This summary is machine-generated.

Choroidal microvascular dropout (CMvD) is less common in primary angle-closure glaucoma (PACG) than in primary open-angle glaucoma (POAG). In both conditions, CMvD correlates with visual field damage, particularly initial parafoveal scotoma.

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Area of Science:

  • Ophthalmology
  • Glaucoma research
  • Vascular imaging

Background:

  • Primary open-angle glaucoma (POAG) and primary angle-closure glaucoma (PACG) are leading causes of irreversible blindness.
  • Choroidal microvascular dropout (CMvD) is a potential indicator of glaucomatous damage.
  • Understanding the prevalence and associations of CMvD in different glaucoma types is crucial for diagnosis and management.

Purpose of the Study:

  • To compare the prevalence of CMvD between POAG and PACG eyes.
  • To identify factors associated with CMvD in both POAG and PACG.

Main Methods:

  • A cross-sectional study involving 36 POAG eyes and 28 PACG eyes.
  • Optical coherence tomography angiography (OCTA) was used to detect CMvD.
  • Visual field (VF) defects were classified, and their association with CMvD was analyzed.

Main Results:

  • CMvD was detected in 58.3% of POAG eyes and 35.7% of PACG eyes (P = .07).
  • In POAG, CMvD was associated with higher intraocular pressure, worse VF mean deviation (MD), thinner retinal nerve fiber layer, and lower peripapillary vessel density.
  • In PACG, CMvD was associated with VF MD. CMvD was significantly more common in POAG overall and associated with initial parafoveal scotoma (IPFS) in both types.

Conclusions:

  • The prevalence of CMvD is lower in PACG compared to POAG.
  • CMvD is associated with advanced visual field damage and IPFS in both POAG and PACG, suggesting a common pathophysiological mechanism involving vascular compromise.