User`s guide

20 16012-101 Rev. C
System Menu Screen (Continued)
Delete Database
Tapping Delete Database will erase the entire database from memory, and delete all examination data. Do not perform
this action if the Pachymeter’s database has not been archived by hotsyncing, unless the data is no longer needed.
You may delete individual entries by entering the View Database page. Select the individual examination you would like
to delete by tapping on the examination line. The examination line will be highlighted. Tap the Delete button.
Note: A deleted database may be recovered by using the Install Tool to install an identical copy archived on the PC.
In the event of filling the entire database, (around 1000 entries), you should backup the archive file onto a PC before
deleting it from the IOPac. After a backup, the database file will have been copied to the PC’s C:\Program
Files\Palm\IOPac\Backup folder. The file P20DBASE.PDB (this is the archived file) should be moved to a
secure location such as a floppy disk or a CD-R. It is recommended that 2 copies be kept. The full examination database
should then be deleted from the IOPac.
IOP Formulas
Formulas 1 through 4 are all of the form:
Corrected IOP = Uncorrected IOP - (Correction × (Measured Corneal
Thickness – Normal Corneal Thickness)). Each is taken from a
published journal article as listed on the IOP Formula References
screen.
Within limits, the end user can set up Custom Formulas 1 through 3 as
they like. These are the same format as the above 4 pre-programmed
formulas, and require the user to input a normal central corneal thickness
and a correction factor in mmHg/um. When finished, tap OK.
IOP Lookup Table
This screen displays the IOP Corrections Table. An alternative to the
formulas is a well known lookup table. The correction to the IOP is
obtained by locating the closest Central Corneal Thickness (CCT) and
Tonometry values to the actual measured ones, and interpolating a
correction value.
The pre-programmed table is based on: Ehlers et al Acta Ophthalmol
1975; 53:34-43