What Researchers Did
Researchers compared visual outcomes in 50 patients who had a central retinal artery occlusion (sudden vision loss from a blocked blood vessel in the eye): 29 received HBOT within 7 days of symptom onset, and 21 did not receive HBOT.
What They Found
The HBOT group improved from a visual acuity of 2.03 logMAR to 1.55 logMAR at 6 months (a significant improvement, p < 0.01), while the control group's vision was essentially unchanged (2.1 to 2.11 logMAR, p = 0.762). The HBOT group also showed significantly greater preservation of outer retinal layer thickness on imaging compared to controls.
What This Means for Canadian Patients
Central retinal artery occlusion is a medical emergency sometimes called an "eye stroke." This study supports treating it with HBOT as urgently as possible, within 7 days of onset. Canadians experiencing sudden vision loss should go to an emergency room immediately, as HBOT access within this window may preserve meaningful vision.
Canadian Relevance
No direct Canadian connection identified.
Study Limitations
This retrospective study had only 50 patients and did not randomly assign treatment, so patients who received HBOT may have differed in other ways from those who did not.