Gilras GRU-5000 A, Operation Manual

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Chapter 4 Operation
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and smoothly. The probe can only be removed after the measurement
completed, the image is automatically frozen and the data is displayed on
the screen.
3) The probe should be placed align with the visual axis to guarantee the
accuracy of measurement.
4) Don’t move the probe directly on the patient’s cornea to avoid injury of
cornea.
2) IMMERSION Method
Under automatic measurement, if IMMERSION method is selected according to §4.3.2.2b, the
operator should gently put the eyecup onto patient’s eyelid, fix the eyecup with eyelid and inject
physiological saline into eyecup as coupling medium. Place the A-Biometer probe into the
coupling medium, and make sure the probe will not contact the cornea. The probe should be
placed perpendicular to the cornea and moved towards the cornea. When the distance
between the probe front and cornea vertex is 2-8mm, start automatic measurement. The rest
operations are the same with that of the CONTACT method.
4.3.2.4 Threshold modification under the AUTO mode
The threshold can be set according to the actual demand. The threshold adjustment range is
50-120 and the default state is that the threshold line is hidden and the threshold value is 100.
Double click the upper part of the waveform quickly to display the threshold line and the current
threshold value, as shown in Figure 4.16. Adjust the position of the threshold line by clicking the up
and down keys. Click the threshold line to hide the threshold line and the threshold value.
Figure 4.16 Diagram of Threshold Line
Note: 1) Normally, the threshold value is not necessary to be modified and the default
setting is recommended.
2) The threshold value will return to default setting after the system is switched
off.
4.3.2.5 Measurement under MANUAL mode
Select manual measuring mode according to §4.3.2.2a), the ARROW MOVE dialogue box and
ARROW MOVE key will pop up automatically. The ARROW MOVE dialogue box is used to move
Threshold line
Threshold