13 Performing a “TF Scan” Examination
46 / 106 Instruction Manual Keratograph 5M (G/77000/XXXX/EN – Rev05)
13.3 Measuring the Tear Meniscus Height
To determine the amount of tear film, it is necessary to measure the tear
meniscus height.
Activate the [TF-Dynamic] radio button.
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.
Adjust the camera image so that the tear meniscus is centrally dis-
played.
Focus the reflected rings of the tear meniscus height.
Press the [Image] button.
You can use the foot switch alternatively, (Chap. 10.10, page 36).
You can find instructions on the magnification changer in Chap. 17.5,
page 59
Fig. 13-4: Measurement of tear meniscus
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