Constantly adjusting pupils?

Discussion in 'Optometry Archives' started by t_mark, Feb 10, 2004.

  1. t_mark

    t_mark Guest

    I'm aware that the pupils constantly shift in accordance with changing light
    levels at any one point as you move around or as light levels change, but
    what would cause pupils that continue to dilate and contract over and over
    in constant light? For example, in a bathroom with overhead lighting
    looking directly into a mirror with no movement of the head, no shifting of
    the eyes to look elsewhere, and nothing moving in the periphery or
    background? My pupils will contract, then dilate, then repeat, they're not
    going from max to minimum to max, sometimes it may dilate to point A and
    contract to point Z and then dilate to poinc C and contract to point Y.
    t_mark, Feb 10, 2004
  2. t_mark

    Jan Guest


    It is the triad between accommodation-convergence-pupilchanges.
    The moment you try to look sharp in the mirror (short distance) at yours
    pupils, they constrict due to the accommodation.

    Jan (normally Dutch spoken)
    Jan, Feb 10, 2004
  3. t_mark

    Otis Brown Guest

    Dear Mark,

    This is just a normal physiological system at work.

    The accommodation system does the same thing -- when
    measured with an infrared optometer.

    Partly it is "noise" in the system, from an
    engineering perspective.

    The "noise" in the accommodation system is about
    0.6 diopters.


    Otis Brown, Feb 20, 2004
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