Bad perscription / glasses or should I get used to a world that slopes???

Discussion in 'Glasses' started by Ian, Nov 30, 2003.

  1. Ian

    Ian Guest

    Apologies if this isn't the place to ask this but...

    I have just received my first glasses - having just been told that I was a
    bit short sighted in my left eye.

    After getting over the shock that I no longer had perfect vision - I decided
    a pair if glasses might be a good idea - even though I was told they were
    not essential yet, but might make driving and using a computer a little more
    comfortable.

    My problem is that after getting the glasses and being pleasantly surprised
    (or completely shocked) at the difference they made to my focus,
    I noticed that things around me had changed shape a bit..books, pictures on
    the wall, walls and door frames..
    Everything that was square before (and still is if I take the glasses off)
    is now larger, and a bit further away on the left side than it is on the
    right,
    and looking down at the floor makes it look like I'm standing on a slope...

    To give an idea of the scale of the distortion a picture about 3 feet wide
    viewed from a couple of feet away appears to be about 3 inches larger at the
    left edge compared to the right....

    So my question is - is this normal and just something I will get used to,
    (bearing in mind that the glasses are not supposed to be essential yet and I
    expected to be able to use them only some of the time - so I will be
    switching between back and forth between a flat and slopped world fairly
    regularly)
    or should I be suspicious of the prescription or the glasses I have been
    supplied?

    The prescription I was given was ..
    Right :
    sphere : -0.75
    cyl. : +0.25
    axis : 120

    Left :
    sphere : -1.25
    cyl. : +1.50
    axis : 90

    Any suggestions or advise would be appreciated

    Thanks

    I
     
    Ian, Nov 30, 2003
    #1
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  2. Ian

    Dr Judy Guest

    This is normal and due to magnification effects when the two eyes do not
    have exactly the same prescription. Return your glasses supplier to make
    sure the frame is adjusted properly, improper placement of the lenses
    enhances the effect.

    You should get used to it, you can speed adaptation by wearing your glasses
    full time for about two weeks.

    Dr Judy
     
    Dr Judy, Nov 30, 2003
    #2
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  3. Ian

    Ian Guest

    Thanks - but won't this give me a problem when I take the glasses off (with
    things sloping/distorting the opposite way),
    if my eyes become accustomed to the slope/distortion created by the
    glasses?

    I'm not really sure I could cope with the world being out of shape when I
    take the glasses off....

    I
     
    Ian, Nov 30, 2003
    #3
  4. Ian

    Ann Guest

    No, it doesn't work like that. I have no idea why and don't suppose
    anyone else does either but the brain gets used to the glasses on but
    doesn't 'forget' the glasses off situation.

    The person was right who said you need to wear the glasses constantly
    for a while. Once you are used to them you can do as you like...
    weird but true.

    Ann
     
    Ann, Nov 30, 2003
    #4
  5. Ian

    Mark A Guest

    What is the exact lens manufacturer, lens model, and material?
     
    Mark A, Nov 30, 2003
    #5
  6. Ian

    Otis Brown Guest

    Dear Ian,

    This is probably a good group to ask. We pleasantly
    disagree with each other on fundamental points.

    The minus lens you have sharpens distant objects wonderfully.

    There is a "school of thought", however that argues that
    you should keep the minus lens off your face as much as
    possible (certainly for all reading) and just use
    them when absolutly necessary.

    There is a similary argument about the cylinder cut
    in your prescription.

    In any event you might enjoy reading about
    the "contrary" point of view on my site:

    http://www.myopiafree.com

    Best,

    Otis
    Engieer
     
    Otis Brown, Dec 1, 2003
    #6
  7. Ian

    LarryDoc Guest

    Except that is not necessarily true. Nor weird. "Anyone else" does.

    Although some people do indeed "record" the optical adaptation and can
    ultimately wear the specs or not with comfort, many people cannot do so,
    especially if there is off-axis astigmatism and unequal refractive error
    in each eye. (Not to mention if the specs are improperly fitted.)

    And for the record, I am a case in point. I do not adjust to my
    spectacles, period. (Hence I use contact lenses.) You can assume
    correctly that the RX is correct and the specs properly adjusted. It's
    my day job to make that so.

    I believe the effect is the same on the other side of the big pond, too.

    --LB

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

    The Eyecare Connection
    http//www.eyecarecontacts.com
    larrydoc at eye-care-contacts dot com (remove -)
     
    LarryDoc, Dec 1, 2003
    #7
  8. Ian

    Dr. Leukoma Guest

    The prescription in the left eye is stronger in one meridian than the
    other, and will act to minify the image in that meridian. The right eye
    has a smaller amount of power that is applied more uniformly throughout the
    visual field. When viewing a wide scene from a few feet away, the right
    outer edge of the frame is perceived entirely by the right eye, but the
    left outer frame is perceived entirely by the left eye. Therefore, you
    perceive the left side as being shorter in height than the right side, thus
    creating this distortion in depth and size. Somebody mentioned that they
    thought the astigmatism was the culprit, and it is to some extent. Since
    the image size difference is a function of the prescription, having it cut
    a bit in the left eye will probably alleviate some of the problem, although
    it might come at a cost of loss of clarity.

    Try to wear the eyeglasses more often for a couple of weeks in order to see
    if you will "adapt." Then go see your doctor or optician.

    DrG
     
    Dr. Leukoma, Dec 1, 2003
    #8
  9. Ian

    Dan Abel Guest

    The eyes provide the raw data for vision, but we really "see" with our
    brains. Of course the world is the same shape, whatever your brain
    thinks. It's just that, with the glasses on, your brain is getting
    different input than it did before. If you wear your glasses full-time,
    then your brain will get used to the new input. Some people can store two
    states in their brain, so that the brain will adjust what it thinks it is
    seeing based on whether the glasses are on or off. Some people can't, and
    it depends on what the correction is also.
     
    Dan Abel, Dec 1, 2003
    #9
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