11 Performing a “Topography” Examination
38 / 106 Instruction Manual Keratograph 5M (G/77000/XXXX/EN – Rev05)
11.1 Patients who are sensitive to light: Low glare with white flash
When examining particularly light-sensitive patients, it may be neces-
sary to reduce the light intensity of the Keratograph.
Low glare with white flash.
The aligning process between the device and the patient`s eye is per-
formed under infrared light. Just the capturing process itself is conduct-
ed with white light. This will allow the patient to open their eye wider,
enlarging the measured area.
11.2 Manually marking the center of the Placido rings
If considerable corneal irregularities are present, the keratometry marks
may not be on a plane with the center point of the Placido rings. Auto-
matic analysis of the topography data is then not possible. In that case,
you will be prompted to manually mark the center of the Placido rings
(“Manual measurement” on page 36).
Fig. 11-2: Topography examination with white flash
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