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Accutome A-Scan Plus User’s Guide
Determining Corneal Power after Refractive Surgery
(Post Rx Surg)
The K value (corneal power or corneal curvature) for
patients that have had corneal refractive surgery cannot
be determined using common methods. Four K Post
formulas, or methods, are available in the Accutome A-
Scan Plus to determine the current corneal power for
refractive patients (Kpost).
*Note: If you do not know the patients prerefractive surgery
corneal power, you may want to consider using the
Haigis formula which does not require this
information.
Post Rx Surg IOL Calculation Steps
The steps to complete a post refractive surgery IOL
Calculation are almost the same as non refractive
surgery eye calculations with the addition of selecting a
Post K method.
To complete a post refractive surgery calculation:
1. Set the Rx Surg field to "Yes".
2. Select an IOL Group (see "Selecting an IOL
Group" on page 200).
3. Select or enter an AXL value (see "Changing the
AXL Value" on page 201 for instructions).
4. Enter the applicable averaged K1and K2 readings,
Sphere, and Cyclinder values.
5. Enter the target value (see "Entering the Target
Value" on page 204).
Selecting a K Post Calculation Method
The K Post calculation methods are:
1. Clinical History method - Calculates Kpost based
on Kpre, refraction before and after refractive sur-
gery.
2. Contact Lens method - Calculates Kpost based on
refraction after refractive surgery with and without
a hard contact lens of a known curve and power.
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