Measurement; Display After The Measurements - Icare Tonovet TV01 Manual De Usuario Y Mantenimiento

Measurement

The measurement should be done without local
anesthetic, because a local anesthetic may reduce
the tonometer reading*.
Secure the subject and bring the tonometer near to
the subject´s eye.
The central groove should be in a horizontal position.
The distance from the eye to the front part of the
collar is the lenght of the collar. The distance should
be 4-8 mm (1/6 - 1/3 inch) from the tip of the
probe to the cornea of the eye.
Measure takes place by lightly pressing the measurement button. The tip of the probe should hit the
central cornea. Six measurements are made consecutively. Press the measurement button carefully,
to avoid shaking the tonometer. After each successful measurement there is a short beep. After the six
measurements, there is a longer beep and the IOP is shown on the display after the d (dog/cat) or h
(horse) letter.
If there is an erroneous measurement, the tonometer will beep twice and show an error message
(page 10). Press the measurement button to clear the error message. If several erroneous measure-
ments appear, see the section "Error messages" (page 10).

Display after the measurements

Before After the second
measurement
00 2.13
After the sixth measurement, there will be a long beeb and the letter d or h appears in the display,
followed by the IOP (Intraocular pressure) reading. If the d or h is blinking, it means that the standard
deviation of the measurements is greater than normal.
d_ (line down) The standard deviation of different measurements is slightly bigger value than normally,
but the effect to the result is not likely to be relevant.
d- (line in the middle) The standard deviation of different measurements is clearly greater than normal,
but the effect on the result is usually not relevant. A new measurement is recommended if the IOP is
higher than normal IOP.
d¯ (line up) The standard deviation of different measurements is great and a new measurement is
recommended.
*Badouin C, Gastaud P. Influence of topical anesthesia on tonometeric values of intraocular pressure.
Ophthalmologica 1994;208:309-313
After the sixth
measurement
d 13
7