Related Experiment Video
Updated: Apr 23, 2026
Retinal Vascular Reactivity as Assessed by Optical Coherence Tomography Angiography
Published on: March 26, 2020
Reproducibility of retinal oxygen saturation in normal and treated glaucomatous eyes
Iman Goharian1, Shawn M Iverson1, Rosa Catalina Ruiz1
1Department of Ophthalmology, Bascom Palmer Eye Institute, University of Miami Miller School of Medicine, Palm Beach Gardens, Florida, USA.
Aim:
To measure the reproducibility of retinal oxygen saturation (SaO2) levels among treated glaucomatous eyes and normal controls in a prospective non-randomised study.
Methods:
Patients with perimetric glaucoma (PG) and normal controls were included. Exclusion criteria for both groups included visual acuity <20/30, unreliable visual fields, thyroidopathies, hemoglobinopathies, cardiovascular and pulmonary diseases. Retinal oximetry was performed twice consecutively on one randomly selected eye of PG and normal controls using spectrophotometric retinal oximeter (SRO; Oxymap ehf., Iceland). Four main retinal vessel pairs were analysed separately. Coefficients of variability (CoV), coefficients of repeatability (CoR) and intraclass correlation coefficients (ICCs) in arteries (a.SaO2) and veins (v.SaO2) were calculated.
Results:
23 PG (mean age 68.3±10.8 years) and 22 normal subjects (mean age 61.5±18.2 years; p=0.14) were included. The intraocular pressure and mean ocular perfusion pressure in glaucoma (14.4±4.2 mm Hg; 45.8±5.8 mm Hg) and controls (14.3±3.3 mm Hg; 45.8±6.1 mm Hg) were similar (p >0.05). In the PG group, the a.SaO2 had a CoV of 1.6%, a CoR of 4.7 and an ICC of 0.97; the v.SaO2 had a CoV of 5.9%, a CoR of 8.7 and an ICC of 0.96. In normals, the a.SaO2 had a CoV of 0.98%, a CoR of 3.3 and an ICC of 0.97; the v.SaO2 had a CoV of 4.8%, a CoR of 7.7 and an ICC of 0.93.
Conclusions:
Retinal oximetry measurements using SRO are highly reproducible in both treated glaucomatous and normal eyes.
