Eye patching has been shown to stimulate the contralateral hemisphere.

Discussion in 'Eye-Care' started by Dave R, Mar 23, 2005.

  1. Dave R

    Dave R Guest

    Eye patching or 'Eye dialogue' has been used in alternate health since
    at least the 1980's to provoke supposedly different hemispheric
    awareness and memory, to the point that some people reveal two rather
    conflicting personalities.

    Recent research is beginning to suggest how this might be possible.

    http://brain.oupjournals.org/cgi/content/full/125/9/2023

    "The results suggest that monocular viewing is associated with
    preferential activation of attentional systems in the contralateral
    hemisphere, and that the right hemisphere (at least in right eye
    dominant subjects) is biased towards far space. Finally, the results
    suggest that the poorly understood phenomenon of eye dominance may be
    related to hemispheric specialization for visual attention."
     
    Dave R, Mar 23, 2005
    #1
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  2. Dave R

    andrew Judd Guest

    Dave

    This is an amazing article. Thanks!

    If this is true then it could be possible that amblyopia is related to
    the patching effect that a better seeing eye is always giving the
    opposite hemisphere. So that over time it preferentially turns on one
    hemisphere at the expense of the other. You would then think that
    just such an opposite patching regime might help amblyopia but this is
    thought to be only true in children. However it has been
    suggested/claimed that a more aggressive intervention at the level of
    the brain and learning can overcome amblyopia even in adults. What
    is known is that if the good eye is lost in an adult the amblyopic eye
    always makes some form of recovery. So its clear there is no hard
    and fast rule for two eyed adults

    Also astigmatism and strabismus seem possibly candidates for this kind
    of interpretation. If what the eye sees, can stimulate prefentially
    one half of the brain, then it follows that the perceptions of one
    half of the brain can preferentially stimulate one eye. And therefore
    conflict in perceptions could lead to subtle conflicts in the
    movements of the eyes as suggested by Roberto Kaplan OD and others.

    Are you aware of MRI studies on amblyopia strabismus astigmatism and
    so forth?

    This is a hugely complicated area. Whatever biases might be in
    operation when patching is done its clear that these effects are only
    biases and very subtle effects. For example no person ever sees the
    difference between their two hemi fields in one eye - its completely
    seamless - even if they have different colour vision in each separate
    eye.

    However Fred Schiffer MD a harvard psychiatrist has used eye patching
    to reveal different perceptions and memories (admittedly using a more
    complex hemi field patch) but I have found that an ordinary patch has
    the same effect for some people in a startling manner as if two
    personalities are revealed.

    Sooner or later this kind of stuff is going to come together in a
    bigger picture sense so that all the conflicting pieces of information
    makes perfect sense!

    Andrew
     
    andrew Judd, Mar 23, 2005
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  3. Dave R

    dave_rogers4 Guest

    Andrew

    I find your hypothesis interesting but I cant see the evidence to
    support it at this stage of the game.

    MRI scans do show normal eye versus amblyonic/strabismic eye
    differences but they appear equally on both sides of the brain.

    http://bjo.bmjjournals.com/cgi/content/full/85/9/1052

    It is true that there may be two forms of amblyopia, only one of which
    developes prior to critical brain development in infancy, so its
    possible, in at least come cases better vision might be possible in
    adulthood via some method.

    I am not sure its possible to say 'all amblyonic eyes get better' if
    the normal eye is lost. Do you have a reference to support that?

    However what you are suggesting is interesting and I would not rule
    anything out in the light of what is now being learnt about the brain.

    Dave
     
    dave_rogers4, Mar 24, 2005
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