Zeiss VISUREF 150, User Manual

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Operation of the device
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Performing a measurement
If you wish to start measurement with the right eye, move the measuring
head to the left using the joystick. OD will be displayed on the screen. If you
wish to measure the left eye, move the measuring head to the right using
the joystick. OS will be displayed on the screen.

If the device does not identify an eye, the cross hairs will be
displayed in white, and no laterality information will be shown.
As soon as the device identifies an eye, the cross hairs change to yellow
(Fig. 30 left). Now focus and center on the patient's pupil.
•
To focus (i.e. generate a focused image of the eye), move the joystick
back and forth.
•
To center (i.e. move the light point in the center of the pupil into the
inner ring of the cross hairs) move the joystick to the left or right. For
fine adjustment of the height, rotate the joystick.
As soon as the eye is focused and centered, the cross hairs change to green
(Fig. 30 right).
During measurement the patient will see a fixation object in the form of a
hot air balloon over a long road on the internal display. If positioned
correctly, he/she should be able to clearly identify this image.

Encourage the patient to relax and look at the red part in the
center of the balloon. This minimizes the accommodation effect.

Shortly before the start of the measurement procedure, ask the
patient not to move during measurement and to keep his/her eye
wide open.
In manual measurement mode, trigger measurement by pressing the
measurement button on the joystick ( 6 , Fig. 3). In automatic measurement
mode, the measurement will be triggered automatically as soon as the
image is correctly focused and centered.