Foggy vision with slight headache(not forehead).humprey fied test normal.sometimes left eye foggy sometimes right eye with back of the headache.

Probably migraine: A one-sided headache with blurry vision is probably a type of migraine. An abnormal Humphrey Field test is concerning because there's a higher risk of a brain tumor, retinal damage or stroke affecting the vision centers of the brain. A negative test doesn't completely rule them out. It's worth seeing a doctor if these symptoms are new.