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DEUTSCH
ENGLISH
FRANÇAIS
ITALIANO
ESPAÑOL
NEDERLANDS
PORTUGUÊS
SVENSKA
© HAAG‑STREIT AG, 3098 Koeniz, Switzerland – HS‑Doc. no. 1500.7220686.04020 – 2. Edition / 2021 – 05
CCT Central corneal thickness
AD Aqueous depth (Back of the cornea to front of
the lens)
ACD Anterior chamber depth
LT Lens thickness
AL Axial eye length (Front of the cornea to inner
limiting membrane)
NOTE!
Since the device measures up to the retinal pigmented epithelium, the
reading displayed is adjusted to the internal limiting membrane, either
automatically, as a function of axial length, or manually, according to the
mode selected. (Manual correction is not available in the USA).
4.3.2 Keratometry
The values displayed (flat radius, steep radius)
correspond to the radii of an ellipsoid that fits into the
cornea. The axis of its rotation is measured counter-
clockwise from the horizontal to the flat radius.
• a: Flat radius
• b: Steep radius
• c: Axis of rotation
4.3.3 Topography, Elevation and Pachymetry
The device provides the user with surface information of the cornea in the following
formats:
• Anterior and posterior axial curvature map
• Anterior and posterior tangential curvature map
• Total corneal power map
• Anterior and posterior elevation map
• Anterior and posterior irregularity map
• Pachymetry map
4.3.4 White to white distance, pupillometry and eccentricity of
the visual axis
The white-to-white distance (WTW) is determined using the image of the iris and the
eye radii obtained from keratometry. The value displayed corresponds to the
diameter of an ideal circle.
Pupil diameter (Ø) corresponds to the diameter of an ideal circle, with the smallest
error perpendicular to the established pupil border. At the same time, the shift of
visual axis towards the centre of the pupil is provided. The calculated dimensions
are located on the theoretically derived level of the iris. The image enlargement
achieved by the refraction of the eye is disregarded.
5 Commissioning
The device is powered though an integrated medical grade power supply, it works
with the voltages specified under chapter 6.2 'Power'. It is not necessary to select
the voltage on the device. Ensure that the power cable used always features the
safety earth pin and that the respective pin is functional on the socked used.
5.1 Switching on the device
• Connect the power plug to the mains.
• Switch on the main switch.
• Start the device by pressing the stand-by / on button.
5.2 Switching off the device
• Exit the software on the device or press the stand-by / on button for more than 3
seconds.
• Only switch of the main switch after the internal computer was shut down and
the screen is blank.
• Disconnect the power from the mains if you do not intend to use the device for
an extended period of time.
