Preparation before surgery
Leica M220 F12 / Ref. 10 716 922 / Version 03 21
7.8 Adjusting the eyebase and
eyepoint (optional)
The distance between both pupils and the desired contact with the
eyepieces are adjusted individually.
You can prepare the surgical microscope before the operation using
the data from a user table.
6555
75
1
2
1 Interpupillary distance scale
2 Setting wheel
Adjusting the interpupillary distance
X
Set the eyelenses of the eyepieces to "0" or select the required
diopter value.
X
Set the magnification changer to step 10.
X
Look into the eyepieces and adjust the tubes with the setting
wheel (2) or by hand (in the case of binocular tubes without a
setting wheel) until a circular field of view is visible.
7.9 Adjusting the parfocality
Rotary ring for
adjusting the diopters
1
Adjusting the diopter settings
X
Adjust the diopter settings accurately for each eye separately
(1); only this method will ensure that the image will stay in
focus throughout the entire magnification range (parfocal).
Prepare the microscope
X
Switch on the microscope at the control unit and place a flat
test object such as a piece of paper beneath the objective.
X
Set the maximum brightness.
X
Set the minimum magnification.
X
Shift the microscope until the test object is visible in the center
of the field of view and reasonably sharp.
Focus on the test object
X
Set the maximum magnification.
X
Focus the microscope.
X
Set the minimum magnification.
Adjusting the diopter settings
X
Adjust the diopter setting for each eye in turn (1), until the
image is seen in sharp focus.
X
Set the maximum magnification.
X
Focus the microscope again.
X
Set the minimum magnification.
X
Inspect the diopter settings, readjusting them if necessary so
that both images are sharp.
Checking parfocality
X
Observe the test object while zooming through the whole
range. The image sharpness must remain constant at all
magnifications. If it does not, then repeat points 2 to 4 of this
procedure.
