Measurement; Display After Measurements; Other Functions; Accessing Old Measurement Value - Icare TA01I Manual De Instrucciones

MEASUREMENT

Since local anesthetic may lower the tonometer
reading, we recommend that you refrain
from using an anesthetic when performing
measurements.
Ask the patient to relax and look straight ahead
at a specific point. Bring the tonometer near the
patient's eye. The central groove should be in a
horizontal position, and the distance from the
eye to the front part of the collar should be the
length of the collar. In other words, the distance
from the tip of the probe to the patient's cornea
(see picture) should be 4-8 mm (5/32 - 5/16inch)
(Figure 6).
If necessary, adjust the distance by turning
the forehead support adjusting wheel. Press
the measurement button lightly to perform
the measurement, taking care not to shake
the tonometer. The tip of the probe should
make contact with the central cornea. Six
measurements are made consecutively. After
each successful measurement, you will hear a
short beep. Once the six measurements have
been performed, the IOP will be shown on the
display after the 'P'.
If there is an erroneous measurement, the
tonometer will beep twice and display an error
message. Press the measurement button to
clear the error message. If several erroneous
measurements appear, see error messages
(See chapter: Error messages).
To obtain the most accurate reading, six
measurements are required, but the result is
also displayed after the first measurement,
which can usually be considered valid. The
measurement values displayed are average
values for all previous measurements (1.-5.).
Single measurement values are not shown.
Should there be variation between the
measurements, 'P' will flash on the display after
the sixth measurement.
Following the performance of the entire
measurement, a new measurement series can
be begun by pressing the measurement button.
The tonometer will then be ready for the next
measurement series (00 will show on the
display, see figure 7).
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If the user doubts the validity of the
measurement (for example, if the probe made
contact with the eyelid, or missed the central
cornea etc.), we recommend that he/she
make a new measurement. In addition, when
encountering unusual values (for example over
22 mmHg or below 8 mmHg) we recommend
the performance of a new measurement to
verify the result.
*Badouin C, Gastaud P. Influence of topical
anesthesia on tonometeric values of intraocular
pressure. Ophthalmologica 1994;208:309-313

DISPLAY AFTER MEASUREMENTS

Before
00
After the sixth measurement, the letter P
appears on the display, followed by the IOP
(Intraocular pressure) reading.
If the P is blinking, it means that the standard
deviation of the measurements is greater than
normal.
P_ (line down) The standard deviation of the
different measurements has a slightly greater
value than normally, but the effect on the result
is unlikely to be relevant.
P-(line in the middle) The standard deviation of
the different measurements is clearly greater
than normal, but the effect on the result is
probably irrelevant. A new measurement is
recommended if the IOP is over 19 mmHg.
P–(line up) The standard deviation of the
different measurements is great and a new
measurement is recommended.

OTHER FUNCTIONS

ACCESSING OLD MEASUREMENT VALUE

(Figures 7-9)
From the starting position, press the right or
left selector button until 'Old' appears on the
display. Then press the measurement button.
You can now 'scroll' through the old values
by pressing the selector buttons (right=older,
left=more recent, from 0-9).
After the second After the sixth
measurement measurement
2. 13 P 13
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