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Medical Forum / General / Vision / March 2006Questions about Unilateral Visual Auras
Hi: Has there ever been a case where a migraine aura consisted of visual hallucinations only in the left half of the left eye, in which the more left you go [in that left half of the left eye] the more the eye is in the hallucinatory world [and less in the real world] while the right eye -- as well as the right half of the left eye -- are completely in the real world? Thanks, Radium Yes, it can be the one eye. It depends on where in the visual pathway that the lack of oxygen occurs as to where the perceived image presents. dr grant "CatmanX" <drgrant@ozemail.com.au> wrote in news:1142995636.551133.43790 @i40g2000cwc.googlegroups.com: > Yes, it can be the one eye. It depends on where in the visual pathway > that the lack of oxygen occurs as to where the perceived image > presents. > > dr grant It would have to be a retinal migraine.  SignatureScott Reverse name to reply > It would have to be a retinal migraine. What types of visual hallucinations are typical of retinal migraines? Can they make the victim dizzy? > Yes, it can be the one eye. It depends on where in the visual pathway > that the lack of oxygen occurs as to where the perceived image > presents. > > dr grant What do most retinal-migraine subjects describe the blindness as? Is it "black" [as in darkness] or "blank" [as in "nothingness", "no description" sort of thing]? "Radium" <glucegen1@excite.com> wrote in news:1143041676.595133.85560 @t31g2000cwb.googlegroups.com: >> Yes, it can be the one eye. It depends on where in the visual pathway >> that the lack of oxygen occurs as to where the perceived image [quoted text clipped - 5 lines] > "black" [as in darkness] or "blank" [as in "nothingness", "no > description" sort of thing]? Be a tad careful here. There are a variety of different things that might be going on. My post was definately making the assumption that a migraine was the cause, which may or may not be the case. Those symptoms could even be the result of a TIA in the retina or optic tract, as opposed to a migraine. In fact, retinal migraine is rare, and its a diagnosis of exclusion. Vascular disease is much more likely, and needs to be ruled out. Hemianopia is on possibility. I'm not a doctor. If I had those symptoms, I would be telling my doctor about them, and sooner rather than later. Check out http://www.migraine-aura.org/EN/ICHD-II_1.4 _Retinal_migraine.html What you'll see is that after the crossover (the "optic chiasm") in the figure shown, everything "brain" is going to be binocular. The only things that would be able to cause aura in one hemisphere of one eye would occur in front of the crossover, with the possible exception of extremely localized problems in the lateral geniculate bodies (the pair of big black spots). SignatureScott Reverse name to reply > I'm not a doctor. If I had those symptoms, I would be telling my doctor > about them, and sooner rather than later. I don't have any of those symptoms but I am interested in them. I tend to be interested in wierd things. A lot of the questions I ask are about things that are hypothetical or theoretical. Many of the conditions I described are VERY rare [if the ever occur at all]. > Check out http://www.migraine-aura.org/EN/ICHD-II_1.4 > _Retinal_migraine.html Thanks > What you'll see is that after the crossover (the "optic chiasm") in the > figure shown, everything "brain" is going to be binocular. The only > things that would be able to cause aura in one hemisphere of one eye > would occur in front of the crossover, > with the possible exception of > extremely localized problems in the lateral geniculate bodies (the pair > of big black spots). I guess these are the locations of the brain I am looking for. Would constriction of capillaries in the lateral geniculate bodies cause the symptoms I describe [e.g. unilateral visual hallucinations]? "Radium" <glucegen1@excite.com> wrote in news:1143058021.035838.194000 @i40g2000cwc.googlegroups.com: > I guess these are the locations of the brain I am looking for. Would > constriction of capillaries in the lateral geniculate bodies cause the > symptoms I describe [e.g. unilateral visual hallucinations]? These things get very tough to say. The lateral geniculate is deep brain, and you can't just "look" at it. The latest, greatest, functional imaging is probably capable of measuring something or other related to bloodflow there, but it hasn't been done yet, so far as I know, in a set of people prone to migraine in that area, so we have no real match between what these migrainors (if this area can even get a migraine) and what they experience We do know that the geniculate has an architecture where certain well known layers (II, III, and V) receive monocular inputs from the ipsilateral temporal retina and others (I, IV, and VI)get input from the contralateral nasal retina--both associated with the visual field on the contralateral side of the body. So, a depolarization wave due to migraine that is well localized to uniocular layers--if such a thing exists-- would cause visual hallucinations in half of one eye. Can't tell you what it would look like. SignatureScott Reverse name to reply > "Radium" <glucegen1@excite.com> wrote in news:1143058021.035838.194000 > @i40g2000cwc.googlegroups.com: [quoted text clipped - 19 lines] > thing exists-- would cause visual hallucinations in half of one eye. > Can't tell you what it would look like. Actually, hallucination is probably not the right word. "Effects", or "aura" is probably more accurate. SignatureScott Reverse name to reply > I don't have any of those symptoms but I am interested in them. I tend > to be interested in wierd things. > > A lot of the questions I ask are about things that are hypothetical or > theoretical. Many of the conditions I described are VERY rare [if the > ever occur at all]. > I guess these are the locations of the brain I am looking for. Would > constriction of capillaries in the lateral geniculate bodies cause the > symptoms I describe [e.g. unilateral visual hallucinations]? Radium I am curious at a personal level - why are you interested in such specific topics? Surely it is more than just general interest? Are you asking for a friend, or undertaking some project, or have some other innocent agenda? What motivates your questions? I ask out of genuine interest, not trying to be a smart-arse. Yours in Curiosity, Dom > What do most retinal-migraine subjects describe the blindness as? Is it > "black" [as in darkness] or "blank" [as in "nothingness", "no > description" sort of thing]? Retinal migraine is so rare that you need to rule out some other problems first. -MT |
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