User`s guide

Page 19
68E3527 Rev. F
Instructions for Use (continued)
Interpreting the LCD Screen
The number display represents IOP in millimeters of mercury (mmHg.) A
number with a single horizontal bar displayed at the bottom of the LCD is
an average of the valid measurements. A number without the single bar is
a single measurement of IOP. Refer to Figure 7.
The display of one of four horizontal bars located along the lower border
of the LCD block indicates the statistical reliability of the averaged
measurement. For example, if the 5% bar is displayed, the standard
deviation of the valid measurements is 5% or less of the number shown.
If the reliability measure is 20% or > 20%, a repeat measurement is
recommended.
A single row of dashes [- - - -] indicates that the instrument is activated.
Two rows of dashes [====] followed by a “beep” indicates that the
instrument is ready to take measurements.
• “CAL” indicates that the instrument is in
the process of calibration check or the
instrument needs to undergo calibration
check procedure. If “CAL” is displayed
following a long beep and “- - - -”, the
latter is the case. A “Good” calibration
check must be obtained.
• “Lob” indicates the need to replace both
batteries prior to using the instrument.
• “UP” indicates that the instrument
is being calibrated and the probe tip
should be turned from pointing down to
pointing up.
• “Good” indicates the calibration check
procedure was successful. After
two “Good” calibration checks, the
Tono-Pen VET unit is ready for use in
patient examinations.
• “bAd” indicates the calibration check
procedure was unsuccessful and must
be repeated.
Figure 7
LCD Showing A Single
IOP Measurement Of 20