Double vision due to contacts

Discussion in 'Contact Lenses' started by James Kilton, Jan 11, 2004.

  1. James Kilton

    James Kilton Guest


    I'm wondering how common it is for prescribed contact lenses to cause
    double vision, and why this occurs (to me). I've experienced this
    with two brands and various strengths, though it seems to be worse as
    the strength increases (i.e., I've tried ones a few notches weaker
    than what I should be at and the effect isn't as bad).

    This is somewhat hard to explain but hopefully I'll manage. I don't
    experience double vision in the sense that I can see two of
    everything. What happens is that, with light items on dark
    backgrounds (usually the only time it's noticeable) such as on a
    computer monitor, a second "copy" of the light item appears above
    where the "real copy" is. Other than when the item is really small,
    the second copy overlaps with the real copy.

    I've noticed that the effect comes and goes (though usually it is
    present), leading me to wonder if the contacts are moving around
    slightly within my eye. So I wonder if it's a sizing issue.

    So, is this a common issue with contacts? And is there a single cause
    or could it be due to a number of things?

    Thanks a bunch for any help.
    James Kilton, Jan 11, 2004
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  2. James Kilton

    The Real Bev Guest

    How bad is your astigmatism? Does the double vision improve if you
    squint? Mine is never fully corrected, and the effect is double vision
    (triple, if you count the astigmatic error in both eyes) when things
    aren't working right.
    This happens with some of my lenses -- apparently there is considerable
    variability among lenses of the same nominal size. Right now my right
    lens is perhaps a bit better than my glasses, but the lens I wore for
    the previous three months required me to pull the skin of my eyelids out
    by hand if I REALLY wanted to see something clearly.

    Not all cultures are equal. If they were, we
    would have a lot more cannibal restaurants.
    The Real Bev, Jan 11, 2004
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  3. James Kilton

    LarryDoc Guest

    The first, and most simple reply is that if your contact lenses degrade
    the quality of your vision or add additional visual artifacts, they are
    not fitted correctly.

    The next answer: If you have uncorrected astigmatism and the total
    prescribed power is undercorrected, you may not notice the "ghost" image
    as everything is out of focus. As you approach the correct spherical
    power, the uncorrected astigmatism becomes more apparent. This sounds
    like what wrote.

    If the effect occurs when your pupils are dilated or when the lens moves
    off center, then the central optic zone is too small for your entrance
    pupil size, and, of course, the lens is improperly fitted.

    So, your issue could be #1, or #2 or both and, in any event, the bottom
    line is that your lenses do not fit and are inappropriate for your
    needs. Try again.


    Dr. Larry Bickford, O.D.
    Family Practice Eye Health & Vision Care

    The Eyecare Connection
    larrydoc at eye-care-contacts dot com (remove -)
    LarryDoc, Jan 11, 2004
  4. James Kilton

    a Guest

    The next answer: If you have uncorrected astigmatism and the total
    I was getting this effect a few months ago, ghost images in just one eye (I
    was seeing two moons, and two lights and ghosts wherever there were high
    contrast areas like road signs), I think this is also what was causing my
    headaches. The optician seemed very reluctant to change my CL prescription
    (as my spectalcle prescitption had not changed), but I managed to get them
    to change it (from -1.25 to -1.5, to match the other eye) and it has been
    much better since. The optician reckoned that such a small change wouldnt
    cause headaches, but it certainly seems to have fixed mine!
    a, Jan 12, 2004
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