my son's vision

Discussion in 'Eye-Care' started by azraii.risa, Apr 18, 2007.

  1. azraii.risa

    azraii.risa Guest

    my son's vision diagnosis was OD: -2.00 + 0.50 x 180
    OS: -2.00 sph

    What does this mean in general? And would this be considered a
    Negative 2.5, 3.5, etc? I am looking into buying my son goggles with a
    somewhat corrective lense and I am not sure what to look for to best
    suit him.

    azraii.risa, Apr 18, 2007
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  2. azraii.risa

    Dom Guest

    This means your son is short-sighted or myopic.

    If you are buying swimming goggles then the closest equivalent would be
    R either -1.50 or -1.75
    L -2.00

    Dom, Apr 18, 2007
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  3. azraii.risa

    Ms.Brainy Guest

    I join this question. I have noticed that there are 2 ways of writing
    the same Rx for myopia (I am not familiar with other kinds of Rx, so
    my question is limited to myopia with astigmatism). It seems to me
    that the 2 following Rx examples are idintical:

    #1. Sphere: -3.00 Cyl: -1.00
    #2. Sphere: -4.00 Cyl: +1.00

    Mathematically speaking it doesn't make much sense, since -3-1=-4,
    whereas -4+1=-3, thus the prescriptions are not equal, but I believe
    that in the optomeric world they are. Am I correct?

    Moreover, would you say that this person refractive correction (I hope
    I am using the proper term) is -3 or -4?
    Ms.Brainy, Apr 18, 2007
  4. azraii.risa

    Ms.Brainy Guest

    Wow! I have a master degree in math, but this optometric math is
    something else! Maybe I should consider it for a Ph.D. subject, LOL!

    Anyway, you Mike, Dr Judy and the others are very helpful in clearing
    up some of the confusion we common folks have. Thanks!
    Ms.Brainy, Apr 19, 2007
  5. azraii.risa

    Ms.Brainy Guest

    I am glad that Dave finds the sense in the "spherical equivalent", but
    I am still puzzled... Adding (or subtracting, which seems to be the
    same thing in optometric math) sphere and cylinder measurements appers
    to me like adding (or subtracting) apples and oranges. My
    understanding is that this "math" is an effort to express roughly the
    refractive correction in one number. Is it?

    This interests me not only from a mathematical POV, but also
    personally, since I am facing a cataract surgery in my right eye (my
    bad eye). I have been told that a disparity between the eyes (or the
    correction? not sure) should not be more than 2D, but I have no idea
    what this "2D" represents, and on the top of it I now don't even know
    whether it's the "spherical equivalent" or simply the sphere. I will
    present my troubling personal problem (and confusion) in a new thread,
    perhaps tomorrow -- too late now.
    Ms.Brainy, Apr 19, 2007
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