6 Device Description
Instruction Manual Keratograph 5M (G/77000/XXXX/EN – Rev05) 21 / 106
Applied parts
6.2 Functionality
The OCULUS Keratograph 5M combines the keratometric measuring
process with topographic mapping.
Measurement of the corneal surface is done by means of a Placido ring
system that is reflected off the cornea. These data are analyzed by the
computer.
Note
Data misuse
OCULUS Optikgeräte GmbH shall not be liable in any form for further
use of the data recorded with the Keratograph 5M or for any calcula-
tions based thereon.
Technical Principle
An illumination system with a special reflector illuminates a transparent
Placido bowl from the rear which contains a series of concentric rings.
The image of this Placido bowl is reflected off the patient’s eye.
This virtual image is captured by a precision objective and a connected
high-resolution color camera.
All distortions due to the different radii of curvature of the patient’s eye
that become visible are available for the measuring process.
1 Housing
2 Joystick
3 Adjusting base
4 Med. Secure Isolator cable connector plug
5 On/Off switch
6 Rating plate (partly visible)
7 Locking screw
8 Camera aperture and fixation mark
9 Placido bowl
10 Test marks
Fig. 6-2: Applied parts
2
1
1 Forehead rest 2 Chin rest
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