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Assessment of Oxidative Damage in the Primary Mouse Ocular Surface Cells/Stem Cells in Response to Ultraviolet-C (UV-C) Damage
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Racial differences in ocular oxidative metabolism: implications for ocular disease.

Carla J Siegfried1, Ying-Bo Shui, Nancy M Holekamp

  • 1Department of Ophthalmology and Visual Sciences, Washington University School of Medicine, St Louis, MO 63110, USA. siegfried@vision.wustl.edu

Archives of Ophthalmology (Chicago, Ill. : 1960)
|July 13, 2011
PubMed
Summary

African American patients have higher oxygen levels in their eyes compared to Caucasian patients, a difference potentially linked to oxidative metabolism and glaucoma risk. Corneal oxygen consumption also declines with age.

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Area of Science:

  • Ophthalmology
  • Physiology
  • Medical Research

Background:

  • Intraocular oxygen levels are crucial for ocular health and can be affected by various factors.
  • Understanding regional oxygen distribution is important for diagnosing and treating eye conditions.

Purpose of the Study:

  • To compare the distribution of partial pressure of oxygen (Po(2)) in different regions of the eye during intraocular surgery.
  • To investigate potential racial and age-related differences in ocular Po(2).

Main Methods:

  • An optical oxygen sensor was inserted into the anterior chamber of patients undergoing intraocular surgery.
  • Po(2) measurements were taken at five specific locations: corneal endothelium, mid-anterior chamber, anterior chamber angle, anterior lens surface, and posterior chamber.
  • Data were analyzed using a 2-tailed unpaired t test and multivariate regression.

Main Results:

  • Significantly higher Po(2) values were observed in African American patients compared to Caucasian patients across all measured locations.
  • Adjusting for age strengthened the association between race and Po(2).
  • Age was independently associated with increased Po(2) beneath the central cornea.

Conclusions:

  • Racial disparities in ocular oxygen levels suggest differences in corneal and lens oxidative metabolism and possibly systemic physiology.
  • Elevated oxygen levels may increase oxidative stress, cell damage, intraocular pressure, and glaucoma risk.
  • Corneal oxygen consumption decreases with increasing age.