Posted 1/22/2010 8:34 PM (GMT -7)
I'm curious about a hypothetical migraine without headache with the only symptom being a visual aura in the left eye while the right eye is totally unaffected. This aura consists of blindness is *without* any blackness, darkening or dimming of vision. Now for those of you who think the blindness is the same thing as seeing blackness when you close your eyes - you are completely wrong. This blindness is like trying to see and there is nothing registering with the brain. You don't see blackness... you don't 'see' anything. The sense to see from the left eye is completely absent.
This unilateral blindness occurs anytime the migraine aura attacks the patient. Episodes can directly affect dreams as well. If the aura occurs while dreaming, the visual dream perceptions seen as from the left eye will completely go blank and dreaming while continue only from what is perceived as being from the right eye.
Has anyone ever experienced these symptoms?
In this type of unilateral blindness, conditions that would normally cause visual hallucinations from the left eye, will not cause those hallucinations. For example, if the patient is using LSD [or other hallucinogens], the visual hallucinations will only be perceived from the right eye, with the left being totally-blank.
This is one powerful form of blindness! To affect dreams/hallucinations!
Normally even a totally-blind subject will still be able to see in dreams/hallucinations so long as the blindness is not congenital. Not in the case of this unilateral visual aura, though!!!!