Final answer:
The main term for the patient's condition is bilateral hemianopia, which is a loss of lateral peripheral vision caused by a growth of the pituitary gland pressing against the optic chiasm.
Step-by-step explanation:
The main term for the patient's condition is bilateral hemianopia. This is a loss of lateral peripheral vision caused by a growth of the pituitary gland pressing against the optic chiasm and interfering with signal transmission. The patient loses the outermost areas of their field of vision and cannot see objects to their right and left.