A patient complains of having constant headaches involving the frontal region. Further examination reveals increased intraocular pressure. The pupil is dilated but, at the time of examination, there is little evidence of visual deficits. The likely diagnosis given to this person is that she has?
b. A tumor of the visual cortex or lateral geniculate nucleus
c. A tumor at the base of the brain impinging upon the optic chiasm
e. Color blindness