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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.
(See Figure ).
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 0% or > 0%, 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.
Interpreting the LCD
Figure LCD
(Single Measurement)
