Preparing For A Measurement; Preparing The Measurement Area - PLUSOPTIX A12C Short Manual

1 Preparing for a measurement

1.1 Preparing the measurement area

The measurement is carried out using infrared light, which is also contained in
sunlight and in the light of bulbs and halogen spotlights, for example. This infrared
light is invisible to the human eye and completely safe.
To obtain correct measurement values, it is important to avoid disruptive sources of
infrared light in the examination room. Close curtains, roller blinds and shutters to
block out the sun's rays.
Turn off all light sources that produce heat. This does not mean that the
examination room should be dark. Cold light sources, such as energy saving bulbs
and neon lights, do not affect the measurement values.
At eye level
See chapter 4.2
The child must look at the Plusoptix Binocular Autorefractor in order for a measurement to be
taken. Make sure that the child is sitting straight and its head is not turned over their
shoulder. The child's knees and nose should be facing the camera.
The attention of infants is steered towards the Plusoptix Binocular Autorefractor by playing a
special warble sound. However, this only works if the child is not distracted by other people
or objects in the examination room. Close the door of the examination room and avoid any
attention-grabbing activities, such as walking around and clicking your fingers. Do not use
any additional fixation aids!
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.
1 meter measuring
distance
Pupil diameter
Minimum 4 mm
Maximum 8 mm
Figure 1: Measuring environment
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No direct sunlight
See chapter 3.5