A patient has sought medical attention because of a loss of different half-fields in the two eyes. Knowing the potential causes of this complaint, the nurse anticipates that the physician will order tests looking for
A)
metal fragments in the eyes.
B)
hemorrhages in the capillaries of both eyes.
C)
an enlarging pituitary tumor.
D)
subarachnoid hemorrhage.
Ans:
C
Feedback:
Enlarging pituitary tumors can produce longitudinal damage through the optic chiasm with loss of medial fibers of the optic nerve representing both nasal retinas and both temporal visual half-fields. The loss of different half-fields in the two eyes is called a heteronymous loss. Metal fragments can get in the eye from welding. Hemorrhages in both eyes have numerous causes like uncontrolled hypertension and diabetes. Subarachnoid hemorrhages are usually trauma related.
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