Eye strokes are often caused by restricted blood vessel circulation, tissue perfusion and a lack of pressure, according to About.com. Nerve tissue can be damaged if nutrients and oxygen aren't able to reach the optic nerve, which can cause a loss of eyesight.
Light sensitivity and a loss of visual contrast are two symptoms of eye stroke, but a person more than likely doesn't know he is about to have an eye stroke, states About.com. Some individuals experience a sudden loss of vision after waking up, and others have a shadow or dark area that affects either the lower or upper portion of the vision.
Risk factors of suffering from an eye stroke include being middle-aged or elderly, having a cardiovascular disease, and having a specific optic disc shape, according to About.com. Taking certain types of sexual enhancement drugs can also increase the chances of suffering an eye stroke, if the person also suffers from a cardiovascular disease.
To tell for certain whether an individual has suffered from an eye stroke, a physician usually asks about pre-existing conditions and looks over the individual's medical history, notes About.com. The physician also takes the patient's blood pressure, examines the optic nerve, and tests visual field and central visual acuity. The physician may also rule out the possibility of an artertic ION, which is a more serious eye stroke. An eye stroke can be treated with corticosteroids and drugs that decrease eye pressure.