Wonder how infrared optometer works and where to buy?

Discussion in 'Optometry Archives' started by Yang X, Mar 4, 2004.

  1. Yang X

    Yang X Guest

    I am interested in the relationship of accommodation and myopia. I
    wonder how infrared optometer works and where to buy infrared
    optometer if I want to do some research on it.
     
    Yang X, Mar 4, 2004
    #1
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  2. Yang X

    Otis Brown Guest

    (Yang X) wrote in message
    Dear Yang,

    I am an engineer, but was curious about the design
    and operation of this instrument. I understand the
    following.

    Yang> I am interested in the relationship of accommodation and myopia.

    Speacking ONLY with respect to the behavior of
    a population of natural eyes -- the following is true
    by direct experiment on the primate eye.

    The natural (young) eye controls its refractive status to its
    average value of accommodation.

    Yang> I wonder how infrared optometer works ...

    The infrared optometer works by projecting and invisible
    beam of infrared light through the eye to the surface
    of the retina. The "light" is reflected (but not detected)
    by the retina.

    The machine can measure the immediate refractive status of
    the eye by determining the properties of the returned
    beam of "light".

    This action of the eye can be put on a strip-chart for
    verification and review.

    The actions of the accommodation system can be seen
    directly by placing targets at different distances
    and verifying the "accommodation response".

    "Tonic Accommodation" is seen to be about -1 to -3 diopters
    more negative that eye-chart readings.

    Yang> ... and where to buy infrared optometer if I want to do
    some research on it.

    The ODs and MDs on this site can help you with that
    question. The instrument is very expensive, and
    is used mostly for scientific research.
    (I hope the price has come down in the last
    10 years!)

    Best,

    Otis
    Engineer
     
    Otis Brown, Mar 4, 2004
    #2
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