Heart or blood vessel problems that can cause chest pain: 1  Angina or a heart attack. 2  A tear in the wall of the aorta, the large blood vessel that takes blood from the heart to the rest of the body (aortic dissection) causes sudden, severe pain in the chest and upper back.
Hemianopsia is a loss of vision in half of the visual field of one eye or both eyes. Common causes are stroke, brain tumor, and trauma to the brain. Normally, the left half of the brain receives vision from the right eye, and vice versa....
The visual field is the portion of the subject's surroundings that can be seen at any one time. The normal extent of field of vision is 50Â° superiorly, 60Â° nasally, 70Â° inferiorly and 90Â° temporally. A visual field defect is a loss of part of the usual field of vision, so it does not include severe visual impairment of either one eye or both.