Performing A Measurement; Preconditions For A Successful Measurement - PLUSOPTIX A12C Short Manual

2 Performing a measurement

2.1 Preconditions for a successful measurement

a) The measuring distance is correct:
The measuring distance must be between 95 cm and 105 cm. Check whether the
camera image on the screen is in focus. You must be able to see the individual hairs on
the eyelids or the eyelashes clearly on the camera image.
b) Patient is not looking at the camera
The Plusoptix Binocular Autorefractor and the eyes of the patient must be aligned with
one another. The patient must look at the nose of the smiley face. For this reason, an
attention grabbing warble sound is emitted at the beginning of the measurement.
Note:
The attention span of infants is very short. You can use the fact that the
examination room is unfamiliar to the infant to your advantage. An attention-
grabbing warble sound and the child-friendly Plusoptix smiley face in this
unfamiliar environment will always arouse interest. Avoid any lengthy
conversations with the parents before the measurement.
Note:
If a child is not looking at the nose of the smiley face during the measurements,
this can cause a termination of the measurement or inaccurate measurement
values of the gaze symmetry. For this reason, do not use any other external
fixation aids!
Both of the patient's pupils should be completely visible
c)
The pupils must not be covered by eyelids, eyelashes or hair, for example. Check
whether both pupils can be seen completely on the screen and whether they are
encircled in green.
d) The pupil diameters must be between 4 and 8 mm
Note:
If a red error message is displayed, an action recommendation is also displayed
below it. More information is available in supplementary short manual 9.
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