Automatic Eye Recognition; Adjusting The Measurement Position; Taking The Measurements - Icare TA022 Instruction Manual

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one after the other to obtain the final IOP reading. The button must be
pressed for at least 3 seconds.
Single mode
You can use the single mode to take individual measurements one at a time.
The single mode is especially useful for those patients who tend to blink
heavily. Here you press the measurement button briefly (1 second) for each
of the six measurements to obtain the final IOP reading (Figure 17).

11.2 AUTOMATIC EYE RECOGNITION

The tonometer includes an automatic eye recognition system that identifies
which eye, right or left, you are measuring. The system has two infrared
LED transmitters just below the probe base and one infrared LED sensor
above the probe base, as in Figure 21. The right-hand transmitter sends
invisible infrared light to the right and the left-hand transmitter to the left.
The infrared light reflects from your nose to the sensor. The sensor knows
from which transmitter the reflected infrared light came, and thus which
eye you are measuring. The resulting eye indication is included in the data
that you can transfer, as described in the section 11. Do not cover the eye
recognition sensors, because covering the sensors causes an error.
EYE RECOGNITION COMPONENTS (Figure 21)
1. Left and right infrared transmitter
2. Infrared sensor

11.3 ADJUSTING THE MEASUREMENT POSITION

The tonometer has two adjustable supports (see points 4 and 5 in Figure 1),
one for the forehead and one for the cheek, as shown in Figure18.
The supports are for ensuring accurate measurement distance and alignment.
To adjust the measurement position:
1. Adjust the supports using the adjustment wheels as shown in Figure 18.
2. Keep the probe horizontal and pointing perpendicularly to the center of
the cornea.
3. Set the distance between the tip of the probe and the center of the
cornea to be 4-8 mm (5/32-5/16") as shown in Figure 19.
4. Read the distance setting (forehead A•1, A•2, etc., cheek B•1, B•2,
etc.) between the arrows on the scale (see point 7 in Figure 2) of the
supports (see Figure 20) and write it down on a support position tag for
a reference if the setting is changed. The support position tag is found in
the Icare tonometer carrying case.
5. Do the same for the other eye unless only one eye needs monitoring.
6. Regularly verify that the support positions are correct. If the distances
are incorrect during measurement, there will be error indications
(section 13).

11.4 TAKING THE MEASUREMENTS

The probe will make a gentle and brief contact with the eye when you take the
measurement. No topical anesthetic is needed. The recommended frequency
of measurements is 3-4 daily with a maximum of 5-6.
To measure intraocular pressure:
1. Check that the MEASURE light still flashes on the back panel.
2. If the MEASURE light does not flash, press the power button and wait
until the MEASURE light illuminates again.
3. Look straight ahead at a specific point while keeping eyes wide open as
shown in Figure 22.
4. Bring the tonometer near the eye, the probe pointing perpendicular to
the center of the cornea without a vertical or horizontal tilt. The position
is correct when the probe base light is green and appears symmetrically
in the center of your view. See Figure 23 and 24.
• Correct alignment of the tonometer (see Figure 25).
• Incorrect alignment of the tonometer (see Figure 26).
• Incorrect alignment of the tonometer. Readjust so that you see only
the front of the tonometer and the green light symmetrically in the
center of your view (see Figure 27).
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