Naked Science Forum

Life Sciences => Physiology & Medicine => Topic started by: George Pope on 15/03/2011 17:52:24

Title: Why do we see blotches after looking at lights?
Post by: George Pope on 15/03/2011 17:52:24
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?
Title: Why do we see blotches after looking at lights?
Post by: RD on 10/03/2011 14:53:57
http://en.wikipedia.org/wiki/Afterimage#Negative_afterimages
Title: None
Post by: Ashia on 05/11/2014 02:44:57
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).
Title: Re: Why do we see blotches after looking at lights?
Post by: RD on 05/11/2014 04:52:14
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 ...

Quote from: http://en.wikipedia.org/wiki/Palinopsia
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
Title: None
Post by: kittyfield on 08/10/2016 23:13:28
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?