Operation Of The Apparatus; Focussing The Microscope; Examination - bon SL-72 Instruction Manual

7 Operation of the apparatus

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.

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 on the head rest to bring the eyes of the patient up to the
level of the making of the head rest (line of vision height).
Turn the slit lamp on.
Look through the microscope and set the desired magnification level.
Centre and focus the eye to be examined with the control level 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 projector 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 filter with the orange markings 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. Use the grey filter to dim the light.
bon SL-72 / SL-75
Diagram 7-1:Slit projector
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