Glasses adjustment for -18.00 RX

Discussion in 'Glasses' started by nearly blind, Nov 6, 2003.

  1. nearly blind

    nearly blind Guest

    My prescription for my left eye is very bad (-18.00).
    I normally only wear contacts and just got an
    updated pair of eyeglasses after 15 years. My right side vision is fine
    but I'm seeing very badly out of my left eye. If I push
    the glasses slightly (1/3 inch) closer to my face my left vision
    becomes great.

    I drew two conclusions from this:
    1) my very high prescription (-18.00) makes my vision
    very sensitive to the distance between my lens and my eye.
    This means the correct prescription is highly dependant on
    the fit of the frames.

    2) For this new pair of eyeglasses/frames I need a stronger
    prescription for my left eye (because pushing the lens closer to
    my eye helped).

    I can get 1 new lens for free but will have to pay to see
    the optometrist again. I got the glasses from a discount place
    that doesn't verify the prescription so I can easily change it myself.
    Is there any way to compute what diopter adjustment
    I need based on the distance the lens normally sits from my eye and
    the amount I have to change this (by pushing) to correct my vision?

    If not I'll probably try increasing from 18.00 to -18.50.

    nearly blind, Nov 6, 2003
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  2. nearly blind

    Mark A Guest

    Not sure that your assumption is correct that you need a different Rx. Your
    Rx is extremely strong, and you probably have high-index aspheric or atoric
    lenses. With these type of lenses, the position of the lens (which obviously
    depends on position of the frame on your face) is critical. It's not just a
    question of adding more power to a lens that is positioned incorrectly.
    Mark A, Nov 6, 2003
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  3. nearly blind

    Dr Judy Guest

    With a high Rx like yours, frame adjustment is critical, even a mm makes a

    It would be easier to take the glasses back to the provider and have the
    frame adjusted. They may be sitting at a slight angle so that the left side
    is further from your face. After they adjust them, check right and left
    again and, if not equal, have them try again. Do not leave until both eyes
    see clearly.

    Dr Judy
    Dr Judy, Nov 6, 2003
  4. nearly blind

    Dan Abel Guest

    That sounds like good advice. However, the OP bought these at a discount
    place, and perhaps they don't do fittings.

    I feel like a hypocrite saying this, but perhaps the OP shouldn't have
    tried to save a few bucks by getting his prescription in one place and the
    glasses in another. Now they don't work and it isn't at all clear who is
    responsible for fixing them. I work in software, and it is very
    attractive to get the whole package from one place. That way, when it
    doesn't work, you just call them up, tell them that it doesn't work, and
    they fix it. Why do I feel like a hypocrite? Because I buy my reading
    glasses OTC. It's true that my OD recommended this, and that the
    prescription is not strong.
    Dan Abel, Nov 6, 2003
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