Section 3 A-Scan Operation and Clinical Use
desired, they may all be deleted by touching
the [ CLR SCANS ] button.
10. Remove Prager Scleral Shell. Once all
desired scans have been captured, raise the
upper eyelid to release the top portion of the
shell from under the eyelid. Pivot the shell
downward, directing the patient to continue
to look straight ahead. Pull the shell away
from the eye without making contact with
the cornea. Upon initial release, the
remaining liquid contents of the shell will
spill down the patient’s cheek (which can be
subsequently wiped with towel or tissue).
PERFORMING IOL CALCULATIONS
The PACSCAN™ uses the measurement data and
selected IOL calculation formula to determine
and display appropriate IOL powers.
1. IOL Calculation. After obtaining acceptable
A-scans, the IOL powers can be determined
by touching the [ IOL CALC ] button. The
IOL Calculation Screen will be displayed
(see Figure 3-8).
Figure 3-8. IOL Calculation Screen Display
2. IOL Power Table. A table is presented
which consists of commercially available
IOL powers in ½ Diopter increments, and
the expected refraction associated with each
IOL power. Values are given for main lens
and alternative lens. The table values are
calculated using the specified IOL formula
(which can be changed by touching the
formula button), the associated formula
constants, the k readings previously entered,
and the average axial length measured.
3. Viewing Other IOL Powers. The IOL power
table is centered around those IOL powers
which produce refraction which is as close
as possible to emmetropia. Other powers and
associated refractions can be viewed by
scrolling using the [ ] and [ ] buttons,
or by touching the [ ] button and entering
a refraction value.
PRINTING
Printed records are available when using the
optional thermal printer. Records are available
for each scan performed and for the IOL powers
calculation table.
1. Print Record Format.
¾ The examination record organizes data
and information into formats as shown
in Figures 3-8 and 3-9.
Figure 3-9. Measurement Exam Record
Doc # 0300-A-1901-3D 3 - 9
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