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What Causes Light-Induced Seizures? Photosensitivity is an intricate medical problem. Scientists have been able to identify many of the triggers, but the mechanism that makes the brain hyper-excitable when the retina gets stimulated in a certain way remains poorly understood. The key features of a provocative stimulus, however, are outlined in a consensus reached by a group of international experts gathered by the Epilepsy Foundation. These are: The flicker of the light source, and the “frequency” at which the light changes. In other words, how many times the light flashes in a second. Generally, flashing lights between the frequencies of five to 30 flashes per second (Hertz) are most likely to trigger seizures. In order to be safe, the consensus recommends that photosensitive individuals should not be exposed to flashes greater than three per second. The intensity of the light source, meaning how bright it is, as well as the “contrast” between light and dark during the flicker. The consensus recommends the contrast between alternating dark and bright images be not greater than 20 candelas per square meter (a technical measure for brightness). The area the light stimulus occupies in the visual field. This is important because it actually determines how much of the brain gets stimulated. For instance, in the case of television viewing at a distance of about nine feet, the consensus recommends the area of the flashing stimulus on the screen be not greater than 25 percent of the total area. This also explains why most affected individuals can prevent the photosensitive reaction by simply covering one eye (monocular vision). The pattern of the image. Static or moving patterns of discernable light and dark stripes have the same effect as flashing lights because of the alternation of dark and bright areas. The danger depends on how many and how contrasted the stripes are in the visual field. The consensus recommends no more than five pairs of stripes if they are moving within the field of vision and no more than eight pairs if they are static. About 30 percent of individuals sensitive to lights are also sensitive to patterns. There are other factors involved, as well. One is the viewer’s distance from the light source because it directly affects the field of vision. For instance, going back to the example of television viewing, the closer the person gets to the screen, the greater the risk. More of the visual field is occupied; therefore, more of the brain gets stimulated. The second factor is color. Certain colors are critical; in particular, the so-called saturated “deep” red. Within the visual spectrum, this color is the one with the longest wavelength and it can be easily eliminated by wearing appropriate optical filters (blue lenses).
What Are the Symptoms of Photosensitive Epilepsy? There are many different types of seizures. People with photosensitive epilepsy typically have what's called a "generalized tonic-clonic seizure." This is also known as a convulsive seizure. A tonic-clonic seizure should last no more than five minutes. Symptoms include:
Loss of consciousness and patient falls to the ground
-Muscles contract and body stiffens
-Patient cries out
-Breathing pattern changes
-Patient bites tongue and inside of cheeks
-Limbs jerk or twitch as muscles tighten and relax
-Loss of bladder control
Does anyone know if this can be caused by a severe concussion/brain injury?
originally posted by: drock905
a reply to: Gothmog
Stroke induced dementia.
If that's true then she should absolutely drop out.
originally posted by: hopeisasound
a reply to: drock905
I believe you're actually seeing the blue sky being reflected in her dark tinted glasses. Not blue lenses?
originally posted by: hopeisasound
a reply to: drock905
I believe you're actually seeing the blue sky being reflected in her dark tinted glasses. Not blue lenses?
originally posted by: bobrottenchild
a reply to: FredT
This really explains well what is going with her IMO:
www.youtube.com...
And would explain the stroke-like symptoms she's been having because of the meds:
www.ncbi.nlm.nih.gov...
originally posted by: bobrottenchild
a reply to: FredT
This really explains well what is going with her IMO:
www.youtube.com...
And would explain the stroke-like symptoms she's been having because of the meds:
www.ncbi.nlm.nih.gov...
originally posted by: AnkhMorpork
originally posted by: bobrottenchild
a reply to: FredT
This really explains well what is going with her IMO:
www.youtube.com...
And would explain the stroke-like symptoms she's been having because of the meds:
www.ncbi.nlm.nih.gov...
I agree with this and I'm a Hillary supporter in many ways. How sad. I hope not, but it's hard to discount.
originally posted by: drock905
Does anyone know if this can be caused by a severe concussion/brain injury? I'm no Hillary fan but If she was suffering from light induced epileptic seizures i don't think that should necessarily exclude someone from running for President.
I'd like to find out if this could be from another underlying medical condition.
..........maybe it was simply a fashion statement.