37
PERFORMING IOL CALCULATIONS
NOTE:
The calculated IOL powers are
NOT to be interpreted as suggested or recommended
implant powers on the part of DGH Technology, Inc
. The calculated IOL should be used as
a guideline only. It is based upon the accuracy of the IOL formula used and the data
entered. The final IOL implant power selection must be made by the surgeon, based on
personal experiences and previous post
-
operative results.
1.
Select the
“
Patient Data
”
Screen and either enter a new patient or select an existing
patient.
2.
Select the
“
A
-
Scan
”
Screen tab and obtain A
-
Scan measurements for the patient. Refer to
the
Performing A
-
Scans (Contact)
or
Performing A
-
Scans (Immersion)
sections for
information on using the Scanmate software for these procedures. Verify that the
information is correct and enter any missing Pre
-
Operative Data.
3.
Select the Doctor that is performing the Lens Replacement Surgery using the drop down
box. The preferred IOLs and formulas will automatically be loaded for the selected Doctor.
4.
If the Patient has previously undergone corneal refractive surgery, select the
“
Post
Refractive
”
checkbox for the affected eye or for both eyes. This will automatically open the
Post Refractive Calculator. Refer to the
Post Refractive Calculations
section for more
information.
5.
Select the measurement source. Choices include A
-
Scan average, A
-
Scan Single
Measurement and User Input. If user input is selected, complete the highlighted fields.
6.
The Corneal Refractive Index (nc) of the keratometer used to calculate the corneal power
(K1 and K2) for the current patient should be entered in this field. This field will
automatically be completed with the default corneal refractive index (nc) set in System
Preferences, but it can be changed by the user on this screen.
WARNING:
Failure to adjust the Default Keratometer Index (nc) to match the actual nc of
the keratometer used to measure the eye may result in errors in the IOL Calculation .
7.
If desired, modify the IOLs and formulas using the appropriate drop
-
down boxes. The
“
default
”
lens constant for the selected IOL and formula will be shown underneath the
formula selection box.
8.
If desired, select the
“
Personalized Constant
”
checkbox. This option will only be available if
a personalized lens constant has been calculated for the currently selected Doctor and IOL.
When selected, the personalized lens constant will replace the default lens constant. Refer
to the
Personalized Lens Constants
section for more information.
9.
Once all necessary inputs are entered, the DGH Scanmate will perform IOL calculations
using the selected formula for each of the six (6) selected IOLs on the screen. Any
necessary inputs for performing an IOL Power Calculation that are either missing or out of
range are automatically highlighted in red.
10.
Save the pre
-
operative data for the current patient and procedure by selecting the
[SAVE]
icon.
