Question about axis in progressive lenses

Discussion in 'Optometry Archives' started by edutital100, Sep 6, 2007.

  1. edutital100

    edutital100 Guest

    I meant to ask about this in a previous post, but forgot.

    I recently found my older pair of progressive bifocals that I got last
    Dec from a local optician. At that time, my prescription was:

    OD: -0.75 SPH (+1.25 ADD)
    OS: -0.50 +.025 080 (+1.25 ADD)

    When I would wear them, the vision didn't seem "right". Although I
    could see far and near well, when I'd read a book, the right top edge
    of the book would slant downward when looking through the glasses. But
    when I'd take the glasses off, the left and right top edges were
    straight.

    When I went for my latest exam, my optometrist checked my glasses and
    said the prescription was as follows:

    OD: -.75 0.00 090 (+1.25 ADD)
    OS: -1.00 +.025 080 (+1.25 ADD)

    She said that my right lens had a "half-assed astigmatic correction"
    with an axis and no cylinder. And my left lens was a 1/4 diopter
    stronger than it was supposed to be. I didn't ask her at the time
    whether this axis was the reason straight edges viewed through the
    right lens were skewed.

    So, with an axis 090 and no cylinder, would this cause my vision to be
    "angled" when looking through that lens? Or is there another reason
    that was happening?

    On a side note, my new prescription is:

    OD: -1.00 SPH (+1.25 ADD)
    OS: -0.75 +.025 080 (+1.25 ADD)

    which I think is somewhat over-corrected. I can see sharply at a
    distance in both eyes, but my mid-vision feels like my eyes are
    "struggling" to keep focused. I am now wearing lined bifocal because I
    really am not a fan of progressives anymore.

    -Ed
     
    edutital100, Sep 6, 2007
    #1
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  2. edutital100

    lena102938 Guest

    Ed,

    You vision correction is only -1D, your astigmatism is only cyl +0.25D
    for distance.
    +1.25ADD for near means that your total correction for
    Reading is only +0.25 -+0..5
    Even without cylinders vision in all progressives using your words
    is "angled".
    Progressives lenses have almost the same amount
    of astigmatic distortion as their add power. In your case
    it is around 1.25D (much more than your cyl +0.25)
    Distortion in that progressives is even actually higher then
    your near correction.+0.5

    Optical quality of bifocals much better than
    Progressives.

    I think it is perfect solution for you, If you are comfortable in
    bifocals.

    Lena, MS Physics.
     
    lena102938, Sep 6, 2007
    #2
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  3. edutital100

    edutital100 Guest

    Thanks for the quick replies Lena and Robert.
     
    edutital100, Sep 7, 2007
    #3
  4. edutital100

    edutital100 Guest

    Ooops, I accidentally hit SEND before I was done.


    No typo. I remember my optometrist's words and have it written down.

    No! My wife and her husband would not be pleased!

    You bet it did! I decided to go back to the optician who made these
    glasses (they are a small, local "mom and pop" place with a good
    reputation) this afternoon. I got the glasses 9 months ago and found
    out they are still under warranty. I told the optician (owner) about
    my issue and he took a good look at the lenses in his lab. He came
    back to me and said the PD was off on the right lens by over a
    millimeter and that my eye was seeing distortion of the progressive
    reading part of the lens. He said he can either replace the lens or
    try changing the curve a bit. He took the glasses and I heard a
    machine going for a few minutes. He tried them on me (with all kinds
    of "x" marks on the lenses) and measured my eyes at different
    positions, then took them back again. A few minutes later he came out
    and had me try them again. He gave me a book. The lenses were fine!

    And yes, he said you can't have an axis without a cylinder, so I don't
    know what my optometrist was saying, but she was dead wrong!

    Thanks again for the info!

    Ed
     
    edutital100, Sep 7, 2007
    #4
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