Scientific Fact versus OD Myth about Natural Eyes Behavior

Discussion in 'Eye-Care' started by otisbrown, Dec 6, 2004.

  1. otisbrown

    otisbrown Guest

    Dear Dan,
    As both of us understand the question is
    one of perspective.
    I believe that a population of natural
    eye must be "dynamic". I am only
    am interested in this property
    of the natural eye which I consider to
    be "base-line" and essential
    of normal operation.
    I therefore do no accept the
    traditional words from the people
    who call refractive states "defects"
    in any form.
    This is the "input" versus "output"
    form of testing, where you are
    only interested in fundamental
    This is similar to the "perspective"
    put on the "facts" by Copernicus
    when he put the Sun at the
    center of the universe -- in his
    I would suggest to anyone who
    is developing an education on this
    subject (i.e., college students)
    consider objective scientific
    facts from these two perspectives.
    They might come to a different
    conclusion about the refractive
    states of the eye -- other
    than the box-camera
    "paradigm" that you have
    been taught -- and believe
    is right.


    otisbrown, Dec 10, 2004
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  2. otisbrown

    Dan Abel Guest

    At least you are friendly about this. I appreciate that.

    It's not the words that are important, it's the concepts behind them. For
    most of my life, I was unable to focus farther away than about an inch.
    This made my uncorrected vision useless both for near and far, where
    "near" is defined as reading distance. I could only read extremely fine
    print, and then only with one eye. You wouldn't call this a "defect"?

    Except that any theory other than putting the sun in the middle, caused
    the "facts" to be contradictory. Simple observation shows that the sun
    revolves around the earth. A more complicated observation of the facts
    shows that it couldn't.

    Of course, they need to consider age and match power of the lens with the
    correction needed.

    I've never been taught that the eye is like a box camera. The only person
    on this group who claims that is you, and you claim that it is false,
    which it obviously is.
    Dan Abel, Dec 10, 2004
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  3. otisbrown

    Dr Judy Guest

    Gee, that's funny, serious scientific researchers use the word
    emmetropization all the time.
    Here, the scientist you quoted in your original post, Frank Schaeffel, uses
    the term:

    J Physiol. 1992 Apr;449:363-76
    Longitudinal chromatic aberration and emmetropization: results from the
    chicken eye.

    Rohrer B, Schaeffel F, Zrenner E.

    Other scientists use it in the titles of their studies too:

    Optom Vis Sci. 1999 Jun;76(6):419-27
    Optical correction of induced axial myopia in the tree shrew: implications
    for emmetropization.

    McBrien NA, Gentle A, Cottriall C.

    Curr Eye Res. 2003 Dec;27(6):371-85.

    Neural pathways subserving negative lens-induced emmetropization in
    chicks--insights from selective lesions of the optic nerve and ciliary

    Wildsoet C.

    and sometimes the study of emmetropization is the purpose of a study:

    Sharp vision: a prerequisite for compensation to myopic defocus in the

    Nevin ST, Schmid KL, Wildsoet CF.

    Center of Eye Research, Queensland University of Technology, Brisbane,

    PURPOSE: Compensatory responses to focusing errors imposed by spectacle
    lenses in chicks, tree shrews and primates leave little doubt that active
    emmetropization can occur, and debate is now centered on whether this
    process is uni-directional or bi-directional in nature.

    Ooops, I forgot, these studies are less than twenty years old, so you won't
    believe them.

    Dr Judy
    Dr Judy, Dec 11, 2004
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