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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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Relationship between iris surface features and angle width in Asian eyes.

Elizabeth Sidhartha1, Monisha Esther Nongpiur2, Carol Y Cheung2

  • 1Singapore Eye Research Institute, Singapore National Eye Centre, Singapore Department of Ophthalmology, Yong Loo Lin School of Medicine, National University of Singapore and National University Health System, Singapore.

Investigative Ophthalmology & Visual Science
|October 25, 2014
PubMed
Summary
This summary is machine-generated.

Iris crypts and color correlate with anterior chamber angle width. More iris crypts and lighter iris color are linked to wider angles, potentially aiding in assessing angle closure risk.

Keywords:
angle closureglaucoma anterior segmentiris

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Area of Science:

  • Ophthalmology
  • Anatomic studies
  • Iris morphology

Background:

  • Anterior chamber angle width is crucial for diagnosing glaucoma.
  • Iris surface features have not been extensively studied in relation to angle width.

Purpose of the Study:

  • To investigate the association between iris surface characteristics and anterior chamber angle dimensions in an Asian population.
  • To explore the potential of iris imaging as a non-invasive method for angle assessment.

Main Methods:

  • Prospective cross-sectional study of 600 subjects from the Singapore Epidemiology of Eye Diseases (SEED) study.
  • Standardized digital slit-lamp iris photographs were graded for crypts and color.
  • Anterior segment optical coherence tomography (AS-OCT) was used to measure angle parameters like angle opening distance (AOD), angle recess area (ARA), and trabecular-iris space area (TISA).

Main Results:

  • Higher iris crypt grade was independently associated with wider AOD750, ARA750, and TISA750.
  • Darker iris color was associated with narrower ARA750 and TISA750.
  • These associations remained significant after adjusting for age, sex, ethnicity, pupil size, and corneal arcus.

Conclusions:

  • Iris surface features, particularly crypt number/size and color, correlate with anterior chamber angle width.
  • Increased iris crypts and lighter iris color are linked to wider anterior chamber angles.
  • Iris surface features may serve as a novel imaging biomarker for estimating angle closure risk.