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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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Non-Invasive Visualization of Nailbed Microvascular Morphology in Mice Using Capillaroscopy
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Nailfold Capillary Hemorrhages: Microvascular Risk Factors for Primary Open-Angle Glaucoma.

Nicholas M Pfahler1, Jordan L Barry1, Indre E Bielskus1

  • 1Department of Ophthalmology and Visual Sciences, University of Illinois at Chicago College of Medicine, Chicago, IL, USA.

Journal of Ophthalmology
|June 27, 2020
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Summary
This summary is machine-generated.

Nailfold capillary hemorrhages are highly specific risk factors for primary open-angle glaucoma (POAG), indicating early systemic microvascular dysfunction. This finding supports their use in clinical risk assessment for POAG.

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Area of Science:

  • Ophthalmology
  • Vascular Biology
  • Glaucoma Research

Background:

  • Primary open-angle glaucoma (POAG) is linked to systemic microvascular dysfunction, including nailfold capillary abnormalities.
  • Previous studies noted hemorrhages and other nailfold capillary changes in POAG patients.

Purpose of the Study:

  • To determine the specificity of nailfold capillary hemorrhages and other abnormalities as risk factors for POAG.
  • To investigate the association between nailfold capillary outcomes and POAG, ocular hypertension (OHT), and secondary glaucoma (SG).

Main Methods:

  • Nailfold video capillaroscopy was performed on controls, POAG, OHT, and SG subjects.
  • Quantified hemorrhages, dilated capillaries, and avascular zones per 100 capillaries.
  • Used logistic regression to compare groups and analyze associations within POAG patients.

Main Results:

  • Nailfold capillary abnormalities, particularly hemorrhages, were significantly increased in POAG patients compared to controls, OHT, and SG.
  • Higher numbers of hemorrhages strongly correlated with POAG (ORs ranging from 9.1 to 18.3).
  • Hemorrhages were not significantly associated with glaucoma surgery, IOP control, or disease severity in POAG.

Conclusions:

  • Systemic microvascular dysfunction, evidenced by nailfold hemorrhages, is common and occurs early in POAG.
  • Nailfold hemorrhages demonstrate high specificity, making them potential clinical risk factors for POAG.