7 Operation of the apparatus
bon SL-85
7 Operation of the apparatus
7.1 Focussing the microscope
Remove the cap and place the test rod in the holder
as shown. Turn the slit lamp on.
Focus the eyepiece so that the grainy surface
of the test rod can be seen in focus at
medium magnification.
Diagram 7-1:Slit projector
7.2 Examination
Allow the patient to rest his/her chin comfortably on the chin rest and ensure that
his/her forehead is on the forehead rest.
Use the height adjuster to bring the eyes of the patient up to the level of the marking
on the head rest (line of vision height).
Turn the slit lamp on.
Look through the microscope and set the desired magnification.
Centre and focus the eye to be examined with the control lever on the base.
In order to reduce patients‘ discomfort, the brightness can be adjusted using the
mains adaptor.
When directly lighting the eye, the slit of the slit projectors is to be projected in line with the
viewing level of the microscope. The height and width of the slit can be adjusted on the slit
projector (see diag. 4.3, page 9). With the slit made smaller, the ray of light from the slit lights
a small section of the eye, placing it into high contrast. When widened, the section of the eye
that can be examined is larger, but the contrast is not so high.
For examination in a red-free image, a green filter is available. Turn the filter dial to the
position with the green markings. The blue filter aids observation of intraocular pressure
measurements, e.g. with an Applanation tonometer. The grey filter can be used to protect the
patient’s eye from heat. The yellow filter on the microscope (see diag. 4.2, page 8) can be
used in conjunction with the blue filter for fluorescence observation, e.g. to view the position
of contact lenses.
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