"Eye strokes occur when blockages (occlusions) occur in arteries or veins in the retina, causing vision loss. The severity of vision loss depends on the extent and location of the occlusion(s) and loss of blood flow.
Just as strokes occur in other parts of the body because blood flow
is blocked, your eye also may suffer damage when vital structures such
as the retina and optic nerve are cut off from nutrients and oxygen flowing through your blood.
Besides having an eye exam
to detect signs of an eye occlusion, you'll also need your family
doctor or internal medicine physician to evaluate you for high blood
pressure, artery disease or heart problems that may be responsible for
the blockage." http://www.allaboutvision.com/conditions/eye-occlusions.htm
Our son is now in the process of more testing. The eye stroke was around noon on Saturday. It was painless, but profound with no vision in the center of his right eye and small streaks or slits (his words) around the edges. Studies have shown that the retina suffers irreversible injury after only 90 minutes of blood flow loss. He went immediately to the ER, had numerous tests which showed nothing, and was seen by a retina specialist on Sunday.
Despite all attempts to preserve vision, even if seen
immediately, most patients suffer severe and permanent visual loss according to the All about Vision web site. We are praying that his case might be that small percentage that doesn't have permanent damage.