Measurement - Icare TA01i Manual De Usuario Y Mantenimiento

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 (1/6-1/3 inch).
If necessary, adjust the distance by turning the forehead support adjusting wheel. Press the measure-
ment 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 (page 10).
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 page 8).
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 22mmHg or below 8 mmHg) we recom-
mend 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
*
o
90
4-8 mm
"
(1/6-1/3 )
7