PLUSOPTIX A12C User Manual page 55

c) Pupils too big!
Cause: This error message is displayed if one or both of the pupil diameters is larger than
8.0 mm.
Reason: In the case of large pupils, the pupillary reflex may be overexposed, which results
in cancellation of the measurement without result. Where measurement results are
nonetheless displayed, these have a larger tolerance.
Tip: Light up the examination room so that the pupils become smaller.
d) Pupils too small!
Cause: This error message is displayed if one or both of the pupil diameters is smaller
than 4.0 mm.
Reason: In the case of small pupils, the pupillary reflex may be underexposed, which results
in cancellation of the measurement without result. Where measurement results are
nonetheless displayed, these have a larger tolerance.
Tip: Darken the examination room so that the pupils become larger. Avoid making the
examination room too dark, as children feel uncomfortable in such an environment
and strain to look around. The examination room should at least be light enough to
be able to read a newspaper.
In this example the pupils are larger than 8.0 mm.
In this example the pupils are smaller than 4.0 mm.
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