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  • FIRST POST
    • glider3560
    • By glider3560 12th Mar 17, 1:30 PM
    • 3,163Posts
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    glider3560
    Astigmatism axis different between prescriptions
    • #1
    • 12th Mar 17, 1:30 PM
    Astigmatism axis different between prescriptions 12th Mar 17 at 1:30 PM
    Before I query with the optician this week, can anyone tell me if they also think this is a bit odd.

    I have astigmatism and have an axis measurement on my prescription.

    2014:
    Left 180.0
    Right 180.0

    2017:
    Left 175.0
    Right 5.0

    It seems odd that the shape of my right eye would have changed over a three year period! Does anyone else think this is also a typo on the right eye?

Page 1
    • boliston
    • By boliston 12th Mar 17, 1:59 PM
    • 2,185 Posts
    • 1,749 Thanks
    boliston
    • #2
    • 12th Mar 17, 1:59 PM
    • #2
    • 12th Mar 17, 1:59 PM
    5 degrees is the smallest change i think (a minute on a clock face is 6 degrees)
    • theoretica
    • By theoretica 12th Mar 17, 4:32 PM
    • 4,724 Posts
    • 5,956 Thanks
    theoretica
    • #3
    • 12th Mar 17, 4:32 PM
    • #3
    • 12th Mar 17, 4:32 PM
    You seem to be thinking that 5 degrees is a whole 175 degrees away from 180 - but it isn't - it is only 5 degrees away, because 180 = 0. The axis goes all the way through the centre point and out the other side.
    But a banker, engaged at enormous expense,
    Had the whole of their cash in his care.
    Lewis Carroll
    • frugalmacdugal
    • By frugalmacdugal 12th Mar 17, 4:39 PM
    • 5,816 Posts
    • 5,026 Thanks
    frugalmacdugal
    • #4
    • 12th Mar 17, 4:39 PM
    • #4
    • 12th Mar 17, 4:39 PM
    Hi,

    Axis. This describes the lens meridian that contains no cylinder power to correct astigmatism. The axis is defined with a number from 1 to 180. The number 90 corresponds to the vertical meridian of the eye, and the number 180 corresponds to the horizontal meridian.

    Y'all take care now.
    • glider3560
    • By glider3560 12th Mar 17, 5:34 PM
    • 3,163 Posts
    • 1,920 Thanks
    glider3560
    • #5
    • 12th Mar 17, 5:34 PM
    • #5
    • 12th Mar 17, 5:34 PM
    Thanks everyone. That's put my mind at rest!

    The optician seemed very rushed, so making a typo could have easily been a possibility. But clearly, that's not the casw.

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