13
3.5
Fundus observation with Hruby lens (optional) -------------------------
In routine applications, only the
anterior segment of the vitreous
body can be examined because of
the refraction effects of the cornea
and crystalline lens. However, with
the Hruby Lens, examination of the
vitreous body is possible.
Operation procedure:
1)
The pupil should be dilated for
about 20 minutes.
2)
Insert the Hruby lens guide plate
(15) into the main shaft hole of the
illumination and the microscope
arm.
3)
Pull out the Hruby lens holder from
one side of the headrest as shown in
Fig.32. Move the Hruby lens holder
toward the operator so that it can
slide freely to the left and right
below the chin-rest. Insert the
lower end of Hruby lens lever into
the groove on the guide plate.
4)
Move the focus of the illumination
light and the microscope to the
patient’s eye.
5)
Move the lever to locate the Hruby
lens at the center of the vision field
and near the patient’s eye, as shown
in Fig.32.
6)
Move the lever to focus the Hruby
lens at the fundus, and then adjust
the slit height and width to reduce
the unnecessary interference light in
the field-of-view.
7)
To examine different parts, either
turn the microscope and the
illumination arm or change the
patient’s fixation by manipulating
the fixation target.
8)
If the long mirror interference in the
examination, just replace it with the
short mirror.
9)
After examination, move the Hruby
lens back to the original position on
one side of the chin-rest.
Attention: before moving the
Hruby lens to the right and left,
first have the patient’s head
move away from the chin-rest to
avoid his nose touching the
Hruby lens.
Fig.32
