Figure 10: Recognizing Correct Measurement Distance - PLUSOPTIX A12C User Manual

Align camera so that both eyes can be seen on the screen. Then slowly move towards patient
until camera picture on screen is in clear focus. In the beginning the pupils are framed with
white boxes (i.e. the picture is blurred), then by red circles and finally by green circles. Stop
moving once a green line is plotted in between both pupils and a second "warble" sound can
be heard. The measurement starts at this point in time automatically.
A "ping" sound signals that the measurement is complete. In addition to the camera image, the
measurement results are now also displayed on screen.
The picture is blurred. The head of the patient is seen almost completely, because the
measurement distance is too big. Move the device towards the patient until the picture is in
clear focus (see next picture).
The picture is in clear focus. Both pupils are framed by a green circle, the line between the
pupils appears in green and an additional "warble" sound can be heard. The device is now
one meter from the child, and the measurement begins automatically. This second "warble"
sound ensures that the child continues to look at the camera during the measurement.
Refrain from moving the device, and wait until the measurement is complete.
The picture is blurred. The eyes are close to the edge of the screen, because the
measurement distance is too small. Move the device away from the patient until the picture
is in clear focus (see previous picture).

Figure 10: Recognizing correct measurement distance

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