Naked Science Forum
Life Sciences => Physiology & Medicine => Topic started by: George Pope on 15/03/2011 17:52:24
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George Pope asked the Naked Scientists:
Why is it that when you look into any type of light for a long period of time that blotches of black appear when you look away?
What do you think?
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http://en.wikipedia.org/wiki/Afterimage#Negative_afterimages
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What does it mean when the blotches last unusually long and/or are triggered by relatively dim flashes (ie:the shine off of a clean car or a traffic light).
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What does it mean when the blotches last unusually long and/or are triggered by relatively dim flashes (ie:the shine off of a clean car or a traffic light).
Drugs (prescribed or "street") or disease which delays/restricts pupils constricting could be responsible ...
Light streaking
Light streaking describes a comet-like tail which is seen due to motion between a person or a light. The streaking usually persists for several seconds before fading and often occurs with bright lights on a dark background. Patients commonly report of difficulty with night driving since the headlights of oncoming cars cause multiple streaks which obscure vision.
http://en.wikipedia.org/wiki/Illusory_palinopsia#Light_streaking
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so when I'm behind a car in line and they have their brake lights on I see bright blue spots where there should be white. why not red?