What do the +/- numbers mean after acuity?

Discussion in 'Optometry Archives' started by douglas, Dec 12, 2009.

  1. douglas

    douglas Guest

    My optometrist told me my acuity measured as 20/40 +2, but I forgot
    what his explanation of the extra integer was. What does it mean when
    acuity has +/- numbers?
    douglas, Dec 12, 2009
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  2. douglas

    Otis Guest

    This depends on the OD who writes the "plus" or "minus" after you read
    your Snellen for him.

    If you incorrectly read on letter, he can record the fact that you did
    not read the line perfectly ( 0 ).

    More typically, it will be marked at 20/20, -2 indicating that you did
    not read two characters correctly.

    The best idea, is to simply ask the OD what he means when he writes +2
    after your reading of the Snellen.

    Second-opinion best,
    Otis, Dec 12, 2009
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  3. douglas

    Neil Brooks Guest

    I love when he deletes the posts that even HE realizes are just

    If only he realized how idiotic ALL of his posts are.....
    Neil Brooks, Dec 12, 2009
  4. douglas

    douglas Guest

    Does the fact that you need +/- numbers for a Snellen eye chart means
    that maybe that chart is slightly confounding acuity with pattern
    recognition, since some letters are more distinct than others? Why
    don't the just use the HOTV chart, where the characters used in each
    line don't change?
    douglas, Dec 12, 2009
  5. douglas

    douglas Guest

    I hope I can convince the optometrist I'll be seeing to evaluate me
    for a Visian ICL to use a Landolt C chart to determine my ICL
    prescription (though I think that'll be taken care of by the
    aberrometer and the other devices). I definitely don't want to pay
    $3500 for a slightly-off implant.
    douglas, Dec 13, 2009
  6. douglas

    douglas Guest

    Well, my OD and EyeMD are sending over my records to him, and my EyeMD
    is a colleague of his from residency who he told me he respects him
    highly. But's that for the purpose of asessing my general eye health;
    he told me he'll be doing specialized tests as a part of the pre-op

    Just wondering: Can a profoundly myopic (-12.5) patient with grade 2
    ROP have cataract surgery safely, or is the risk of retinal detachment
    too high. My eye surgeon told me in emails that replacing the natural
    lens with an IOL would cause the vitreous to swell and put undue
    traction on the retina, on top of the traction due to increased length
    of the eyeball, plus the traction from the ROP.
    douglas, Dec 15, 2009
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