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© HAAG‑STREIT AG, 3098 Koeniz, Switzerland – HS‑Doc. no. 1500.7220686.04020 – 2. Edition / 2021 – 05
3.8 Replacement of the chin rest tray
Grasp the chin rest tray (black plastic part) with your thumb and index finger. Now
pull it towards you. The tray will slide from the metal chin rest mechanism on the
device. Clean the chin rest tray as described in chapter 8.1 'Cleaning'.
To mount the chin rest tray again slide it back on the metal chin rest mechanism
until you may not pull it further in.
4 Operation
4.1 Position of patient during measurement
NOTE!
Prior to the measurement procedure, clean the patient interface
forehead rest band, chin rest shell and both handles including their
supporting parts as described in chapter 8.1 'Cleaning'.
A steady head position is promoted by resting the patient’s head in good contact
with the chin rest and forehead rest band, and by the patient holding on to the hand
grips. This can positively influence adjustment time and measuring accuracy.
The patient should sit upright, in a relaxed position. Adjust the height of the
instrument table and chair of the patient to allow a relaxed lightly downwards
directed gaze position. The height adjustment of the chin rest is performed via the
touch screen user interface or the two arrow-multifunction buttons on top of the
device. Additional height indication marks at the device cover representing the eye
height level and may help position the chin rest in a good initial position. Details on
the measurement process are described in the software instructions for use of the
device.
WARNING!
• Always check the chosen measure mode and patient settings.
• Do not place any unapproved optical elements between the device
and the patient’s eye.
• The motorized chin rest may pose a crushing hazard.
NOTE!
In order to get the best possible results, the patient should be requested
to keep the eye as wide open as possible during the measurement and
to focus on the fixation target. The measurement starts when the fixation
target changes its color from green to blue. The measurement is
finished when the fixation target turns green again. Blinking is permitted
throughout the measurement process, but should be kept to a minimum.
Patients with tremor might be assisted by the user or a third person in
holding their head still.
4.2 Fixation
To obtain reliable results, the patient must stare at the multi-color fixation target in
the measuring lens during measurement.
4.3 Measured variables
4.3.1 A-Scan
Depending on the patient’s gaze at the fixation target, the optical path length of the
visual axis is measured:
