Difference between these 2 scripts?

Discussion in 'Optometry Archives' started by Ed, Oct 20, 2008.

  1. Ed

    Ed Guest

    Hello,

    Several months ago, I went for a routine exam (optometrist) and was
    given this prescription:

    OD:

    Sph= -1.00
    Cyl= SPH
    Axis= ----
    Add= +1.25

    OS:

    Sph= -0.75
    Cyl= +0.25
    Axis= 080
    Add= +1.25

    Recently, I had 2 strange occurances of distorted vision in one eye,
    where these falshing & pulsating colorful "triangular shaped" designs
    appeared in my central vision, then expanded outward throughout my
    field of vision, then disappeared. All within a 20 minute time
    period. So I went to an opthamologist who, after a series of all
    kinds of tests, diagnosed me with occular migraine. He also performed
    a refration and came up with the following prescription:

    OD:

    Sph= -1.00
    Cyl= SPH
    Axis= -----
    Add= +1.75

    OS:

    Sph= -.050
    Cyl= -.050
    Axis= 170
    Add= +1.75


    Other than the obvious increase in add strength, what is the
    difference in the left eye scripts? It appears that the newer script
    is about 1/2 diopter stronger?

    My current glasses have the older prescription. I can see perfectly in
    the left eye. My distance vision in the left eye is actually slightly
    more "crisp" than in my right eye (close up is the opposite, with the
    right eye seeing more "crisp" than the left). I'm a bit apprehensive
    about getting glasses based on this newer prescription.

    Thanks,
    -Ed
     
    Ed, Oct 20, 2008
    #1
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  2. Ed

    otisbrown Guest

    Ed,

    Subject: Comparing these two "prescriptions".

    I am an engineer, not a "doctor" -- but here is the math
    to compare these two "prescriptions".

    Remember that there are two "methods" to write the
    astigmatic part of the prescription. (i.e., cyl.)

    Ophthamologists thend to write "plus", optometrists
    generally write " minus ". So with that in mind:

    Several months ago, I went for a routine exam (optometrist) and was
    given this prescription:

    ##########
    Old:

    (The right eye is virtally no change. )

    Left eye:



    OS:
    Sph= -0.75
    Cyl= +0.25
    Axis= 080
    Add= +1.25

    New
    OS:

    Sph= -.050
    Cyl= -.050
    Axis= 170
    Add= +1.75

    To simplify this comparison, just convert to "spherical equivalent.
    Old Left Eye: -0.625 Equivalent
    New Left Eye: -0.750 Equivalent

    Difference: 0.125

    This is within the range of normal measurement error. For distance
    vision, there
    is virtually no change.

    I am certain you will get more commentary on this issue. But both
    prescriptions
    are quite accurate, given normal variaions in any given measurement.

    Enjoy,
     
    otisbrown, Oct 20, 2008
    #2
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