What Researchers Did
Researchers reviewed outcomes in 41 patients with central retinal artery occlusion (CRAO) treated with HBOT at the Mayo Clinic over 12 years, examining how treatment timing affected visual acuity recovery.
What They Found
Patients treated within 9 hours of symptom onset had significantly greater visual improvement: 70% showed clinically meaningful improvement versus only 28.6% of those treated after 9 hours (p=0.008). Median improvement was 5.9 lines of vision in the early group versus 0 lines in the delayed group (p<0.001).
What This Means for Canadian Patients
CRAO is essentially a stroke of the eye, and like brain stroke, time is critical. Canadians experiencing sudden vision loss should present to emergency departments immediately, as HBOT may partially restore vision but only if started within approximately 9 hours of symptom onset.
Canadian Relevance
No direct Canadian connection identified. Access to emergency HBOT for CRAO in Canada varies significantly by province and city.
Study Limitations
This is a retrospective single-center study without a control group, making it impossible to determine how much visual recovery was due to HBOT versus natural history.