Thread View: sci.med.vision
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Started by Radium
Sat, 27 May 2006 04:46
Visual Migraine
Author: Radium
Date: Sat, 27 May 2006 04:46
Date: Sat, 27 May 2006 04:46
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Visual migraine affects the lens of the left eye causing auras. The blood vessels supplying the lens constrict suddenly and completely. This starves the lens of necessary proteins it can only recieve from the blood (hemoglobin included). Symptoms are: 1. Visual distortion; 2-D images appear 3-D; visual hallucinations 2. Loss of image perception 3. Loss of color perception 4. Intense aching pain in that lens due to protein starvation 5. Sudden and complete blindess; subject cannot tell even dark or light!; the description is usualy "seeing nothing at all", no light, no darkness. Just totaly blank. Wierd feeling!
Re: Visual Migraine
Author: Salmon Egg
Date: Sat, 27 May 2006 06:59
Date: Sat, 27 May 2006 06:59
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On 5/26/06 9:46 PM, in article 1148705198.722080.295630@j33g2000cwa.googlegroups.com, "Radium" <glucegen@excite.com> wrote: > Visual migraine affects the lens of the left eye causing auras. The > blood vessels supplying the lens constrict suddenly and completely. > This starves the lens of necessary proteins it can only recieve from > the blood (hemoglobin included). Symptoms are: > > 1. Visual distortion; 2-D images appear 3-D; visual hallucinations > 2. Loss of image perception > 3. Loss of color perception > 4. Intense aching pain in that lens due to protein starvation > 5. Sudden and complete blindess; subject cannot tell even dark or > light!; the description is usualy "seeing nothing at all", no light, no > darkness. Just totaly blank. Wierd feeling! > I think this posted "information" is incorrect. I am not a health professional. I presume you mean ocular migraine. Having suffered through ocular migraine, I was informed by ophthalmologists and neurologists, that this phenomenon is not related to defects of the eye itself. It is caused by not well understood neurological factors after signals from the retina pass through the optic nerve chiasm. Of course, your problem might be something else. Bill -- Ferme le Bush
Re: Visual Migraine
Author: judy.n
Date: Sat, 27 May 2006 13:22
Date: Sat, 27 May 2006 13:22
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Bill, I agree with you. The lens is actually not really supplied with direct blood vessels, the ocular symptoms of migraine are due to disturbances in the cortex of the brain that controls vision and/or the optic nerve. The lens only refracts light, it doesn't produce vision--that's what the retina and brain are for. At least that's my current understanding of the mechanism for visual changes in migraine and opthalmic migraine. (Without doing some basic research into this.) Judy
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