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Post Cataract Prescription

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kevbirder
kevbirder

I have had my cataract surgery and eyes have settled, but I currently need glasses for distance and have an astigmatism. I am trying to work out for myself what prescription would work and came up with this for my right eye

Sphere -1.00

Cylinder +0.5

Axis 180

This is actually very good because I have now got some glasses made to this prescription and it sorts out my issues. My question here is whether this prescription is written in the ideal way . Although it looks very different, would the following be the same and if so does it matter which one is used ?

Sphere -0.5

Cylinder -0.5

Axis 90

The reason I am trying to work it out myself is that I have had some differences with the optometrist and would like to understand and if necessary tweak my prescription to suit myself.

0 likes, 6 replies

6 Replies

  • RonAKA
    RonAKA kevbirder

    Posted

    The second way is the normal convention (negative cylinder) used by optometrists. The first way with positive cylinder is the convention used by most ophthalmologists. I agree with your conversion.

  • Night-Hawk
    Night-Hawk kevbirder

    Posted

    The negative cylinder format is usually how optometrists provide the Rx.

    The positive cylinder format is favored by opthalmologists.

    • kevbirder
      kevbirder Night-Hawk

      Posted

      Thanks. Do you know how optometrists decide which will be the sphere value? Is it for instance the smallest value, i.e. nearest to zero either way negative or positive?

    • RonAKA
      RonAKA kevbirder

      Posted

      Standard practice is to use a Phoropter. Then it is your pick as to what looks best to you between the available choices which are in 0.25 D steps.

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