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Author Topic: Why does nearly shutting my eyes create a vertical illusion?  (Read 1503 times)

Vatsal

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Vatsal asked the Naked Scientists:
   
If i close my eyes 80%-90% and watch a source of light (moon,street light), why does there appear to be a light ray going straight "up" from the source, rather than in any other direction?

If not familiar, you can try it right now by looking at, say, a window and closing your eyes to see the vertical effect.

What do you think?
« Last Edit: 24/04/2010 14:30:03 by _system »


 

Offline RD

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Why does nearly shutting my eyes create a vertical illusion?
« Reply #1 on: 24/04/2010 16:08:42 »
If the ray only occurs when you squint it is probably the result of diffraction at the straight(ish) edge of your eyelid which is then over your pupil.

« Last Edit: 24/04/2010 17:01:48 by RD »
 

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Why does nearly shutting my eyes create a vertical illusion?
« Reply #1 on: 24/04/2010 16:08:42 »

 

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