In this example, the sun is shining in the patient’s face from the left. This can be seen
from the shadows over the nose.
d) Pupils too small!
Cause: This error message is shown if one or both pupil diameters are smaller than 3.0
mm.
Reason: The pupil reflexes will be underexposed if the pupils are too small. In this case,
the measurement will be interrupted inconclusively. If measurement values are
still shown, these have a greater tolerance.
Tip: Make the examination room darker so that the pupils get bigger. Avoid an
excessively dark examination room, as children will feel unhappy and try and look
around. The examination room should be at least so bright that you could read a
newspaper.
e) Too much IR ambient light!
Cause: This error message is shown if there is too much infrared light in the examination
room.
Reason: The measurement is carried out using infrared light and other sources of infrared
light (e.g. sun, halogen spotlights, lightbulbs etc.) cause disturbances.
Tip: Close the curtains to block out the sunlight, turn off or dim heat-radiating light
sources or point them in a different direction.
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