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Related Concept Videos

Pulse Oximetry01:24

Pulse Oximetry

Pulse oximetry, or SpO2, is a non-invasive method for continuously monitoring arterial oxygen saturation (SaO2). This procedure involves attaching a probe or sensor to the patient's fingertip, forehead, earlobe, or nose bridge. The sensor works by detecting changes in oxygen saturation levels through light signals generated by the oximeter and reflected by the pulsing blood under the probe.
Purpose
Average SpO2 values are greater than 95%. If the readings fall below 90%, it indicates that...
The Retina01:32

The Retina

The retina is a layer of nervous tissue at the back of the eye that transduces light into neural signals. This process, called phototransduction, is carried out by rod and cone photoreceptor cells in the back of the retina.

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Related Experiment Video

Updated: May 13, 2026

Retinal Vascular Reactivity as Assessed by Optical Coherence Tomography Angiography
07:23

Retinal Vascular Reactivity as Assessed by Optical Coherence Tomography Angiography

Published on: March 26, 2020

Retinal oximetry.

Sveinn Hakon Hardarson1

  • 1School of Health Sciences, University of Iceland, Iceland. sveinnha@hi.is

Acta Ophthalmologica
|March 9, 2013
PubMed
Summary
This summary is machine-generated.

This study introduces a novel dual-wavelength oximetry technique for non-invasively measuring retinal oxygen saturation in humans. The technology reveals altered oxygen levels in various retinal diseases, including vein occlusions, artery occlusions, and diabetic retinopathy.

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Area of Science:

  • Ophthalmology
  • Medical Technology
  • Physiology

Background:

  • Retinal blood flow and oxygenation are crucial for vision and implicated in diseases like diabetic retinopathy and glaucoma.
  • Current methods for measuring retinal oxygenation are often invasive or rely on animal studies, limiting human research.
  • Non-invasive technology for accurate human retinal oxygen measurements has been scarce.

Purpose of the Study:

  • To describe and evaluate a novel dual-wavelength retinal oximetry technology for non-invasive human retinal oxygen saturation measurements.
  • To investigate retinal vessel oxygen saturation in healthy volunteers under varying light conditions.
  • To assess retinal oxygen saturation in patients with central retinal vein occlusion, branch retinal vein occlusion, central retinal artery occlusion, diabetic retinopathy, and those undergoing glaucoma surgery or medication.

Main Methods:

  • Utilized a fundus camera-based retinal oximeter with an image splitter to capture simultaneous images at 586 nm and 605 nm.
  • Employed custom analysis software to measure light absorbance differences sensitive to oxygen saturation at 605 nm.
  • Applied the technology to healthy volunteers and patients with various retinal conditions.

Main Results:

  • Retinal vessel oxygen saturation decreased significantly in light compared to dark conditions in healthy volunteers.
  • Patients with central retinal vein occlusion showed lower venular saturation, while those with central retinal artery occlusion had lower arteriolar saturation.
  • Diabetic retinopathy patients exhibited increased retinal arteriolar and venular oxygen saturation.
  • Glaucoma surgery led to a slight increase in arteriolar oxygen saturation, and dorzolamide medication showed a minor reduction.

Conclusions:

  • Dual-wavelength oximetry is a viable non-invasive method for measuring human retinal vessel oxygen saturation.
  • The technology can detect altered oxygen saturation levels in various retinal diseases, offering insights into disease mechanisms.
  • Findings highlight the potential of this technology for diagnosing and monitoring retinal conditions.