Performing A Measurement; Preconditions For A Successful Measurement - PLUSOPTIX Vision Screener 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 37 and 41 inch (95 and 105 cm). Check
whether the camera image on the screen is in focus. You must be able to see individual
hair of the eyelids or eyelashes clearly on the camera image.
b) Patient is looking at the camera
The device 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:
If a child is not looking at the nose of the smiley face during the measurements,
this can cause an inconclusive measurement. Knees and nose of the child
always have to point towards the device.
Both of the patient's pupils are completely visible
c)
The pupils must not be covered by e.g. eyelids, eyelashes or hair. Check whether both
pupils can be seen completely on the screen and whether they are encircled in green.
d) Both pupil diameters must be between 3 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 10.
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