21 Cleaning, disinfection and maintenance
Instruction Manual Keratograph 5M (G/77000/XXXX/EN – Rev05) 85 / 106
21.5 Reference Measurement
To achieve a high measuring accuracy, the Keratograph must be set up
before conducting the first examination on a patient.
The first reference measurement is performed during setup by OCULUS
or an authorized dealer.
OCULUS recommends performing a reference measurement once each
month. The reference measurement can be performed easily and quick-
ly using the reference sphere (r = 8.000 mm).
A reference measurement should also be performed after the device is
set up in a new location.
Required Materials
Reference sphere (r=8.000 mm), provided
Cleaning alcohol
Measuring With The Reference Sphere
Prerequisite: the Keratograph 5M has been turned on for at least
15 minutes.
For the reference measurement proceed as follows:
Thoroughly clean the reference sphere before saving reference val-
ues (e.g. with cleaning alcohol).
Fasten the sphere holder on the right vertical brace of the head-
chin rest.
Rotate the sphere holder so that the reference sphere is aligned
parallel to the device.
Fig. 21-3: Sphere holder with reference sphere
Fig. 21-4: Align the reference sphere in parallel (device as seen from
above)
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