Zeiss HUMPHREY 720i User Manual - page 160

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FILE FUNCTIONS

REV. B 02/03 PN 51680-1

HUMPHREY FIELD ANALYZER II -

 i

series

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.

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