A video of Vinny DiGirolamo (26th Co.) recounting his experience treating his Central Retinal Artery Occlusion with Hyperbaric Oxygen Therapy (HBOT) was added to Classmates on Video page. Central retinal artery occlusion is the blockage of blood to the retina of one eye. It usually causes sudden loss of eyesight in one eye. You are higher risk if you are older or have high blood pressure, glaucoma, or diabetes. You are also at higher risk if your blood is thicker and stickier than normal.