Zeiss HUMPHREY 720i User Manual page 160

8-14
REV. B 02/03 PN 51680-1
To initialize a floppy or magneto-optical disk:
You must always use formatted disks with your HFA II. The following procedure may be used
on disks previously formatted.
1. Start at the File Functions screen. Select INITIALIZE DISK.
2. Select the disk and insert a floppy or magneto-optical disk into the appropriate drive.
3. Select OK to proceed with the initialization or CANCEL to leave the disk intact and return to
the File Functions menu. If you select OK, the next screen displays, "Formatting disk".
Remember that the INITIALIZE DISK function permanently erases ALL information
currently stored on either the floppy disk or magneto-optical disk in the disk drive.
4. Remove the disk when you see the confirmation message, "Floppy Successfully Formatted"
or "Magneto-optical Successfully Formatted." If the formatting fails, repeat steps 1-3.
Caution: INITIALIZE DISK prepares the disk to record information from the
HFA II. All data previously stored on the disk will be erased during initialization.
Duplication and initialization of the floppy disk may also be done using any IBM PC
compatible computer. Use only High Density (HD) 1.44 MB disks. Regular density
(720 K) and Super High Density (2.88 MB) disks will not work with the HFA II.
To compare test results:
The Compare feature analyzes the results of two threshold tests to show the change in
threshold values. Negative values indicate decreased sensitivity; positive values indicate
increased sensitivity.
Tests must be from the same patient, the same eye, the same test type, and must be of the same
test pattern with one exception: 24-2 and 30-2 tests may be analyzed together. However, only
the points the patterns share in common will be compared. Tests must also be stored on the
same disk. You may print the results of a COMPARE TESTS by pressing the PRINT FUNCTIONS
icon. Compared test results cannot be saved.
1
To compare two tests,
select COMPARE TESTS
from the File Functions menu.
2
Select either HARD
DRIVE or FLOPPY to
indicate your test source.
Press PROCEED.
3
Select the two tests that
you wish to compare,
making sure that they are for the
same patient. The order in
which you choose them is not important because the calculations are based on the test dates.
4
Press PROCEED. The Compare Test screen will appear. It features a test pattern with
the change in sensitivity between the tests at each point in the visual field. As noted above,
negative values indicate decreased sensitivity; positive values indicate increased sensitivity.
HUMPHREY FIELD ANALYZER II -
FILE FUNCTIONS
i
series