h) Corneal reflexes are too dark!
Cause: This error message is displayed if the corneal reflexes are too dark.
Reason: The measurement is carried out with infrared light which is reflected from the
retina. If too little light comes back from the retina, no measurement can be
taken.
Tip: Darken the examination room so that the pupils become larger and more infrared
light can return to the camera.
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