User`s guide

Page 14
To perform an IOP measurement:
Instruct the patient to look straight ahead at the xation target with his/her
eyes fully open.
Hold the TONO-PEN VET unit as you would a pencil.
Position yourself to facilitate viewing of the probe tip and patient’s cornea
where contact will be made. For normal corneas, central corneal contact is
recommended.
Brace the heel of your hand on the patient’s cheek for stability while holding
the TONO-PEN VET unit perpendicular to and within 1/2 inch of the patient’s
cornea. (See Figure 6 for correct positioning.)
To initiate an IOP measurement, depress the Operator’s Button once, and
only once.
Initially you will see a brief display of [8.8.8.8]. This is a self-test of the LCD
(Liquid Crystal Display). If any of the LCD segments are not displayed, the
TONO-PEN requires service.
If a momentary display of [CAL] is seen, followed immediately by a single row
of dashes [- - - -], it indicates that the TONO-PEN requires calibration before
it will measure.
If a double row of dashes [====] is seen and a “beep” tone is heard, it
indicates that the TONO-PEN is ready to measure IOP. Proceed with
applanation within 15 seconds.
Note: After acquiring the double row of dashes [====], if more than 15
seconds elapses prior to applanation, the TONO-PEN will not measure. The
software will have initiated a battery-saving function, indicated initially by the
display of a single row of dashes [- - - -], then followed in sequence by a blank
display [ ]. A new IOP measurement can be initiated by depressing the
operator’s button once.
1.
2.
3.
4.
5.
6.
7.
8.
9.
Taking a Measurement
Figure 6 Corneal Applanation
Correct Incorrect