20
probe tip alignment and positioning. For instructions on changing the length of the
Good Measurement and Poor Applanation delays, see the beginning of this
section.
If the message of “POOR APLANATION” keeps appearing on the display, check
to insure the probe tip actually touches the cornea and is perpendicular to the
corneal surface.
5. Whenever an acceptable measurement has been made, the top line of the display
will indicate the corneal thickness in microns. All thickness measurements are
based on a corneal velocity of 1640 m/sec. Simultaneously, the bottom line of the
display indicates a biased corneal thickness (in microns) that is based on surgical
requirements as defined by the operator. Refer to the beginning of this section for
instructions on changing the percentage that determines the biased measurement.
6. All measurements can be reviewed on the display by using the
↑
or
↓
keys on the
front panel. A new measurement may be taken at any position by causing the
appropriate position number to appear on the display and then retaking the new
measurement. Any measurement that is suspect may also be erased by pressing the
DELETE MEAS
key.
7. All measurements remain in memory until the
CLEAR
key is pressed or the
Pachette
2
is turned off. Press
CLEAR
to erase all measurements and re-initialize
the
Pachette 2
for a new measurement sequence starting at position #1.
IX.B. FLAP Option
The basic
Pachette 2
can obtain corneal measurements as thin as 200 microns.
However, if Lasik flap measurements need to be obtained, then the FLAP option
should be installed. This option allows corneal measurements as thin as 95 microns to
be obtained. When the FLAP option is installed, the
Pachette 2
operates exactly the
same way as it did without the option. The only difference is that the unit is now
capable of taking thinner measurements. To identify a
Pachette 2
with the FLAP
option installed, check for a label that says “FLAP” located on the back panel of the
unit next to the serial number.
IX.C. Printer Interface Option
The printer interface option is a software/hardware interface that allows the
Pachette 2
to be connected to a serial printer. The hardware interface that is utilized is the industry