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....
Therefore a stroke, lesion, or injury at the point where the nasal fibers from each eye cross (where the fibers make an X, called the optic chiasm), would cause loss of the right visual field in the right eye and loss of the left visual field in the left eye.