Welcome to the message board forum for Krukenbergs Spindle and Pigment Dispersion Syndrome.
Here you will be able to post messages or reply to messages posted by other people... share your experiences of PDS or Krukenbergs.
Tracy's Message Board Forum
Welcome to the message board forum for Krukenbergs Spindle and Pigment Dispersion Syndrome. Here you will be able to post messages or reply to messages posted by other people... share your experiences of PDS or Krukenbergs. |
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| Viewing Page 1 of 1 (Total Posts: 3) |
| Author | Comment |
jo
 IP: 81.76.96.253 Aug 4, 07 - 7:48 PM |
The colour green
Hi Ever since the sun has been out these last few days, when I have been reading in the garden, then come indoors, all I can see is green. Scary or what. Does anyone else get this? It is very green and lasts about 5 mins and I can hardly see. I suffer from K.S.D. Scared now. Thank you jo. 
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Dave
IP: 193.62.251.16 Aug 7th, 2007 - 10:58 AM |
Re: The colour green
What you are experiencing is a combination of retinal bleaching, colour opponency and the after effects that result from it. Our photorecepters (the cells which detect light) at the back of the eye respond to light by a chemical reaction. If the light is turned off the chemical reaction reverses itself. An especially bright light on for a long period will "bleach" these cells by pushing the chemical reaction so far to one side it takes a few minutes for the reaction to stabilise enough for vision to be restored. This is the part that makes it difficult to see. Farther up the visual pathway you have one of a series of steps which determine our perception of colour. One of these is a colour opponency system where colours get determined by where they fall on a balance between red/green and blue/yellow. You have just been outside in, what I presume to be an orangeish light thus pushing both of these balences away from the middle towards green & blue. This system, after prolonged exposure to one colour becomes more sensitive to the opposite colour, through a similar mechanism to retinal bleaching. Thus a blue/green effect on leaving the sun. I notice this most when I have fallen asleep in the sun, as the red of your eyelids really tints sunlight nicely. But I wouldn't want to suggest you were having a nap... |
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jo
IP: 90.241.49.74 Aug 7th, 2007 - 1:28 PM |
Re: The colour green
Hi Dave. Thank you once again, and wow, you certainly know your stuff! I was not napping, just pretending to read. I use a lot of bleach when cleaning the house! mmmmm Thank you, I can impress all my friends with my,(sorry your) knowledge. Cheers. jo 
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