Why are prisms badly tolerated by patients?

Discussion in 'Optometry Archives' started by fresnelp, Jan 2, 2005.

  1. fresnelp

    fresnelp Guest

    Hi all,

    Several times I read that prisms are not tolerated well by strabismus
    patients. I wore them too and did not feel comfortable. But I can't
    exactly pinpoint the reasons. Does anyone know why prisms are not

    fresnelp, Jan 2, 2005
  2. fresnelp

    Dr. Leukoma Guest

    wrote in
    I haven't found that to be the case.

    Sometimes, people with strabismus have a form called non-commitant
    strabismus, where there is a paralysis or paresis of one nerve or muscle.
    This causes the deviation to be variable depending on the position of gaze.
    In other words, the eyes may deviate quite a bit when looking down and to
    the right, but not up and to the left, etc. The value of the prism in the
    eyeglasses, on the other hand, is constant.

    Prescribing prism is something of an art, or at least a practiced skill.

    Dr. Leukoma, Jan 3, 2005
  3. fresnelp

    fresnelp Guest

    Thank you for the reply. As I come to think about it, yes, the cause of
    my discomfort is this variability. Are there progressive prisms on the
    market - e.g. 5 prisms gradually growing to 10 prisms all in one lens?
    Could that be the solution?

    What about the distortion of images associated with prisms?

    Best regqrds,
    fresnelp, Jan 3, 2005
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