your husband's MRI report says two things....
One- he has a tumor, which apparently had been present earlier too and is unchanged, but is pressing upon an important structure called the optic chiasm
(it takes part in vision)
second - he has disease of the blood vessels of the brain...usually seen in high blood pressure
, diabetes,smoking, high cholesterol
consult a neurosurgeon for the first, and consult a neurologist
for the second, for which a thorough physical examination and some lab tests would be recommended