Big difference between contact / glasses prescription???

Discussion in 'Glasses' started by jishywa, May 19, 2006.

  1. jishywa

    jishywa Guest


    I recently had my eyes checked and I am not sure that my prescription
    is correct. The strength of the sph. reading is flipped for which eye
    is stronger between the contact lens and glasses prescription.

    I realize the prescriptions can be different, but I am not a huge fan
    of my eye doctor to begin with and I am suspicious there is a mistake

    Can somebody tell me if these prescriptions make sense together?


    R: sph. -3.75 / cyl. -2.25 / axis: 110
    L: sph. -4.00 / cyl. -1.75 / axis: 90

    Contact lens:

    R: sph. -3.50 / cyl -2.25 / axis: 110
    L: sph. -3.25 / cyl -1.75 / axis 90

    It seems to me that one of the two is flipped - that tthe sph. is
    weaker on the contacts since they sit closer to my eye, but that
    perhaps the eyes are flipped? Or could this be correct?

    All the other aspects are the same...

    Please help!

    jishywa, May 19, 2006
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  2. jishywa

    Neil Brooks Guest

    I'm not an eye doctor, but ...

    Were these prescriptions written as the result of two different eye
    exams on two different days, or did he measure you once and then write
    the glasses AND contact lens prescriptions??

    How old are you??
    Neil Brooks, May 19, 2006
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  3. jishywa

    jishywa Guest

    This was written on the same day - it wasn't my first time there, so he
    was more checking them against past ones, but he assigned both those on
    the same day. I am 27
    jishywa, May 20, 2006
  4. jishywa

    Neil Brooks Guest

    Hm. Sounsd odd to me. Have you asked him to confirm that this is what
    he meant to right??

    My "back of the envelope" calc's say that your spec Rx should translate
    into approximately this .. for a toric soft lens:

    OD: -3.50 -2.00 x110
    OS: -3.75 -1.50 x90

    You sure you read it right (the left eye #)?? If you read it right,
    maybe he wrote it wrong.

    I'd check with him. Sounds like a slip-up. If it is, then it's good
    that you caught it.

    Again, though, I'm not a doc ... just a man ... like any other man ...
    only more so....
    Neil Brooks, May 20, 2006
  5. jishywa

    Neil Brooks Guest


    Ignore my astigmatism readings. I used a calculator without making any
    adjustments to your Keratometry readings.
    Neil Brooks, May 20, 2006
  6. jishywa

    LarryDoc Guest

    If you make the assumption that the on-eye power might be .50 less than
    spectacle power, then it would appear that the contact sphere power is
    incorrect. BUT:

    If your distance vision is equally clear (and this would assume the cyl
    is correct), then the powers are correct. Sometimes, when fitting toric
    lenses, the resultant powers don't always come out as one might
    mathematically predict. The doc can easily make the determination, so
    why not just ask to have it verified.

    LB, O.D.
    LarryDoc, May 20, 2006
  7. jishywa

    jishywa Guest

    What do you mean "if your distance vision is equally clear, then the
    powers are correct"?

    It is very hard for me to judge whether these are correct myself -
    partially cause Toric lenses are always a bit funky.

    I guess I am trying to get some confidence that this type of flipping
    could easily happen. Otherwise I guess the only way to confirm is to
    get an independent eye exam but I would prefer to not spend the money

    jishywa, May 20, 2006
  8. jishywa

    LarryDoc Guest

    If your left eye is undercorrected, things will be blurry, again
    assuming the astigmatism component is correct and then lens is properly

    Still confused and/or concerned? See a doctor face-to-face. I don't
    think you can go any further in this forum.

    LB, O.D.
    LarryDoc, May 20, 2006
  9. jishywa

    ashnay Guest

    monovision? Are you around 42 y/o? either that or the 2 should read 7
    (-3.25 v. -3.75)
    ashnay, May 22, 2006
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