Central retinal artery occlusion (CRAO) is a relatively rare emergent condition of the eye resulting in sudden painless and significant vision loss.

CRAO is a medical emergency which has a poor prognosis if not attended to promptly.  Patients particularly at risk include those with giant cell arteritis, atherosclerosis and thromboembolic disease.

The visual signs and symptom of vascular occlusive diseases of the retina are dependent on both the particular vessel occluded, the degree of occlusion, the location of the occlusion, and the presence or absence of a cilioretinal artery.

The retina has the highest rate of oxygen consumption of any organ in the body.Therefore it is very sensitive to ischaemia. HBOT treatment must be started with the time that retinal tissue can still recover. HBOT is a low risk therapeutic option with demonstrated benefit in treating CRAO if treatment is begun before the retina suffers irreversible ischemic damage and there is an intact choroidal circulation.

Hyperbaric Oxygen Therapy

Increase in oxygen tension leading to greater capillary oxygen diffusion distances in the cilioretinal artery. Encourages recanalization of other vessels to supply oxygen to the retina.