Haag-Streit BQ 900 Mode D'emploi page 13

3. Switch on the illumination unit by turning the power supply
switch. Control level of slit illumination
• knob on the power supply
• 10% grey filter (54)
4. Rotate the control lever (52) until the light beam is at eye
level.
5. Microscope magnification is changed by rotating the
magnification changer (48).
6. Holding the control lever (52), inclined towards yourself, move
the instrument base until the slit appears to be approximately
in focus on the cornea. This coarse setting is achieved with
the naked eye. Fine adjustments are obtained by rotating
and tilting the lever while observing the image through the
microscope (46).
7. The slit width is adjusted to the left or right by means
of the knob (51), which also adjusts the angle between the
microscope and the illumination unit.
8. The slit image is made vertical, horizontal, or given any
desired angle by means of control knob (45) (notches at 45°,
90° and 135°; stops at 0° and 180°).
9. In order to ensure the possibility of conducting a binocular
fundus examination in optical cross section without difficulty
from side angles between 3 and 10°, the shorter mirror (47)
should be installed, the illumination unit is rotated through
90° with the knurled control knob (45) and with the latch (50)
in stages of 5°, the illumination unit and the microscope are
turned to the center position (0°).
10. Loosening the centering screw (49) will allow the slit image to
be moved off center for scleral illumination. Tightening the screw
will recenter the slit image in the visual field of the microscope.
11. For general observations over a wide field the grey
filter is placed in position by means of lever (44), and the slit
is opened wide.
12. For examination of the posterior of the eye, preset lenses
or diagnostic contact lenses have to be used.
Filters (44)
53 Open aperture
54 Grey filter (10%)
55 Redfree filter
56 Empty space for accommodating an add. filter
Apertures (43) operating (45)
57 Fixation star (particularly suitable for examining the
fixation in amblyopia)
58 Apertures producing areas of 8, 5, 3, 2, 1 and 0.2 mm ø
59 Indication of wedge-shaped diaphragm for continuous
slit length adjustment in mm
60 Blue filter
The UV filter and the heat absorption filter are permanently
mounted according to standard ISO 10939!
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48
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50
51
52
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1500.7001000.04120
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© Haag-Streit AG, CH-3098 Koeniz, Switzerland
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