13 Performing a “TF Scan” Examination
Instruction Manual Keratograph 5M (G/77000/XXXX/EN – Rev05) 47 / 106
13.4 Measuring NIKBUT
With the NIKBUT measurement (Non Invasive Keratograph Break-Up
Time), the dissolution period of the tear film is determined. Infrared light
or white light is used for illumination in this case.
Activate the [NIKBUT] radio button on the left in the examination
bar.
Select [IR] or [White] lighting in the group box on the right.
Infrared light (IR) is not visible to the human eye. The use of this type of
illumination for measuring purposes prevents the patient’s eye from be-
ing dazzled. This, in turn avoids falsification of the measuring results
caused by an irritation secretion, which could occur in patients who are
sensitive to light.
Adjust the camera if necessary, Chap. 17.5, page 59.
After successful positioning and adjustment this prompt appears:
„Blink 2 times“.
Ask the patient to blink twice.
The measurement is performed.
Please tell the patient to keep his eye open as long as it is comfort-
able.
Fig. 13-5: NIKBUT IR examination
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