Question about eyes reacting to a flash

Discussion in 'Photography' started by dominique.sebastian44, Aug 9, 2012.

  1. When someone takes your picture in a dark room, and uses a flash, you
    see spots for awhile afterwards from the flash.

    Well, recently we had a bad storm at night and a bolt of lightning hit
    nearby. After that extremely bright flash of lightning, I could see
    that lightning bolt everywhere, even in the pitch black sky. The exact
    same shape of it lingered in my vision. If I closed my eyes, I still
    saw that bolt. This lasted 20 minutes or so before it finally went
    away.

    Why does this happen to our eyes?

    (Maybe this is more of a scientific question, but I'm not sure where
    else to ask)...
     
    dominique.sebastian44, Aug 9, 2012
    #1
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  2. The flash overwhelms the receptors in the retina which take a while to
    recover.
     
    Charles E. Hardwidge, Aug 9, 2012
    #2
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  3. dominique.sebastian44

    Savageduck Guest

    Exactly.
    Effectively the flash of light is so intense it temporarily bleaches
    the rods in retina. This is particularly noticeable when the eye has
    been conditioned for night vision by a period of darkness before
    exposure to the flash. Many times, when suddenly exposed to intense
    light, the blood vessels of the retina can be discernible in the field
    of vision for a few seconds to several minutes because they lies over
    the light sensitive receptors and you are seeing their shadows.

    The receptors in the retina are the rods & cones. The rods are where
    the chemical pigment Rhodopsin is stored and because it is extremely
    sensitive to the full light spectrum when it gets dark, it can take the
    rhodopsin up to 30 minutes to regenerate restoring night vision. The
    rhodopsin is less sensitive to long wavelengths, and that is why red
    light is used to preserve night vision. Those of you familiar with
    working in a darkroom under a safelight will be familiar with this
    effect.

    So what happened to you, was your night vision adapted eyes were
    exposed to the full spectrum bright flash of lightning, bleaching the
    rhodopsin in the rods of your retina. It took 20 minutes for it to be
    restored to restore your night vision.
     
    Savageduck, Aug 9, 2012
    #3
  4. dominique.sebastian44

    Noons Guest

    Look up "OD". As in "Over Dose".
     
    Noons, Aug 9, 2012
    #4
  5. dominique.sebastian44

    otter Guest

    This is what the establishment conspirators would like you to
    believe. The reality is in moments like this, you get glimpses of
    other realities that are not normally noticeable, like the ghosts or
    UFO's that some whackjobs like to call "lens flare", or "bokeh" etc.
     
    otter, Aug 11, 2012
    #5
  6. Yeah, let's invent ghosts and whole interstellar civilisations
    when a little physics demonstrably explain the whole effect just
    as well. That's the way to go.

    BTW: there are tiny pixies living in the pixels (pixie housings)
    that paint the image onto the sensor so it can be recorded.

    -Wolfgang
     
    Wolfgang Weisselberg, Aug 19, 2012
    #6
  7. dominique.sebastian44

    otter Guest

    Ack!! I'm being attacked by a gang of humorless wolves!
     
    otter, Aug 20, 2012
    #7
  8. dominique.sebastian44

    ASCII Guest

    Is that why 'pixel peeping' ia so popular?
     
    ASCII, Aug 21, 2012
    #8
  9. dominique.sebastian44

    Stella Smith Guest

    I think its happened just because of rapid and extraordinary light and our eyes can't absorb extraordinary lights at the moments so that is why its happened.
    This is a simple answer so hope nothing too boring from me.

    Stella Smith
    http://www.dbphotographysussex.com/
     
    Stella Smith, Sep 6, 2012
    #9
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