Decrease in sphere, increase in cylinder ---> what's the effect?

Discussion in 'Optometry Archives' started by NIEQ100, Sep 9, 2006.

  1. NIEQ100

    NIEQ100 Guest

    I'm 30 yrs old; I had a recent eye exam and dilation ---> no problems
    were found. I went to the optometrist because I'm having a slight
    "contrast problem" with my right eye - very slight (but enough to cause
    headaches). Basically it's a small sense of 'brightness' in my right
    eye while using the computer, and the same 'slight' brightness looking
    around (at any distance) while outside in the daytime. My sphere is
    -4.00, cylinder -1.00.

    Interestingly, I just now found a pair of old reading glasses (+1.50)
    and while wearing BOTH pairs of glasses at the same time, the
    brightness (while staring at the computer screen) is completely GONE.
    As soon as I remove the reading glasses, it returns instantly. I
    believe this might be an important discovery but I don't know enough to
    suggest a course of action to my optometrist. This is why I'm asking
    for opinions here :)

    I'm assuming that the reading glasses are decreasing the overall
    sphere, and that this is making my eye feel better. But if he decreases
    the sphere to make it easier for me to stare at the computer it would
    make it more difficult to see far away (-4.00 is already a little weak
    I think).

    My question is, if he decreases the sphere to correct my computer
    problem, will an equal increase in cylinder (from -1.00 to -1.50) allow
    me to continue seeing well enough at far distances?
     
    NIEQ100, Sep 9, 2006
    #1
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  2. NIEQ100

    NIEQ100 Guest

    Inotherwords, what would the effect be of going from:

    -4.00 -1.00

    TO

    -3.50 -2.25 (or something like this --- I don't think a decrease in
    sphere of 1.50 is needed, just a slight decrease would probably do the
    trick?)
     
    NIEQ100, Sep 9, 2006
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  3. NIEQ100

    otisbrown Guest

    You can conver to "Spherical Equivalent"

    Just take 1/2 the astigmatic value and add it to the sphere:

    -4.0 astig -1

    would be -4.5 spherical-equivalent.

    -3.5 - 1.1

    -4.6 spherical equivalent.

    The spherical-equivalent are about the same.

    It comes down to the issue of image-sharpness for
    you and what is comfortable when working
    on the computer.

    Just one man's opinion.

    Otis
     
    otisbrown, Sep 9, 2006
    #3
  4. NIEQ100

    A Lieberma Guest

    Please disregard Otis's postings. He is not in the medical profession and
    not in any position to give medical advice.

    Thank you!

    Allen
     
    A Lieberma, Sep 9, 2006
    #4
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