Operation
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Positioning the patient for measurements
•
Renew the upper paper pad on the chin rest after each patient.
•
Ask the patient to position his/her chin on the motorized chin rest and
forehead against the forehead rest.
•
Ensure that the patient's chin is on the front edge of the chin rest.
•
At least half of the patient's pupil must be visible. If this is not the case,
adjust the height of the chin rest until the patient's pupil is in the
window.
•
Ask the patient to look through the opening in the device at the test
mark - a picture of a long road with a hot air balloon in the distance. To
rule out accommodation, the patient should concentrate on the stripes
on the balloon.
•
If the patient fails to see the balloon at first, ask him or her to continue
looking until the balloon appears.
•
Ask the patient shortly before the measurement to avoid any movement
during measurements and hold the eye open as far as possible as well as
not to blink.
•
Start the measurement by clicking on the
Measure
button in the
Measurement
dialog. The automatic measurement procedure starts.
To minimize measurement errors due to tear film changes when
the eye is opened too long, the patient should be asked to blink
several times immediately before the measurement procedure.
•
Ask the patient to blink again shortly after completing the centration, but
still during focusing. The display above the image window shows the
following: Centering √ Focusing….
•
Prior to wavefront measurement ask the patient to continue looking at
the balloon, even when the red laser light appears.
