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Updated: May 9, 2026

Retinal Vascular Reactivity as Assessed by Optical Coherence Tomography Angiography
Published on: March 26, 2020
Normative values and predictors of retinal oxygen saturation
Pooja D Jani1, Jean-Claude Mwanza, Kyle B Billow
1Department of Ophthalmology, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina.
This study established normal retinal oxygen saturation (SO2) values in a healthy multiethnic population. Retinal SO2 decreases with age, a factor crucial for accurate interpretation of oximetry measurements.
Area of Science:
- Ophthalmology
- Medical Devices
- Physiology
Background:
- Retinal oxygen saturation (SO2) is a key physiological parameter.
- Establishing normative data is essential for clinical interpretation.
- Previous studies lacked multiethnic representation.
Purpose of the Study:
- Determine normal retinal SO2 values in a healthy multiethnic cohort.
- Investigate associations between retinal SO2 and demographic/clinical factors.
- Provide reference values for retinal oximetry.
Main Methods:
- Retinal oximetry performed on 61 healthy subjects.
- Measured global and quadrant venous (SvO2) and arterial oxygen saturation (SaO2).
- Analyzed associations with age, gender, ethnicity, and medical history.
Main Results:
- Average SvO2: 55.3±7.1%, Average SaO2: 90.4±4.3%.
- Age correlated with decreased SvO2 and SaO2.
- Inferonasal SaO2 higher in Asians; controlled hypertension linked to increased arteriovenous difference.
Conclusions:
- First description of retinal SO2 in a healthy, multiethnic population.
- Aging significantly impacts SvO2 and SaO2.
- Demographic and clinical factors, except age and hypertension history, showed minimal influence.
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