Difference in reading power of New Rx vs Old Rx

Discussion in 'Optometry Archives' started by Mark A, Jan 9, 2007.

  1. Mark A

    Mark A Guest

    I just received my new Rx and I am trying to figure out how much difference
    there is from my old one, especially in the reading area. I am concerned
    about this because I have found that over the 50 years that I worn glasses,
    that many ODs and OMDs tend to over-prescribe my hyperopia. This is
    especially problematic for progressives.

    Note that OD and OS are exactly the same because of amblyopia in right eye.
    Two different OD's did the refraction 3 years apart.

    Old Rx
    OD +4.25 -1.00 x 90
    OS +4.25 -1.00 x 90
    Add +2.00

    New Rx
    OD +4.75 -1.75 x 90
    OS +4.75 -1.75 x 90
    Add +2.25

    Question--Is the reading power in the New Rx +.75 diopter stronger than the
    Old Rx (increase of +.50 in sphere and +.25 in Add), or is this offset
    somewhat by the -.50 higher cyl (-1.75 vs 1.25) in the new Rx?

    Along the same lines as above, what is real difference in the distance power
    (does some of the increase in minus cyl offset the increase in sphere).
     
    Mark A, Jan 9, 2007
    #1
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  2. Mark A

    Mark A Guest

    What about the reading power? Is it +4.75 + 2.25 (+7.00)? Or is it
    also reduced somewhat by the -1.75 cyl ?
     
    Mark A, Jan 10, 2007
    #2
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