User`s guide

68E34 41 Rev.G

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 instru-

ment.

• “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 XL 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

Instructions for Use (continued)