Wide-Angle Observation System (Such As Oculus) - Leica M844 User Manual

Preparation before surgery
7.9.13 Phototoxic damage to the retina during eye
surgery (slit illumination)
WARNING
Damage to the eyes due to prolonged exposure!
The light of the instrument may be harmful. Risk of eye
damage increases with the duration of exposure.
During exposure to the light from this instrument, do
X
not exceed the hazard reference values.
An exposure to this instrument for longer than 2.8 min
at maximum output power exceeds the exposure limits..
The following table shows the allowed surgery durations and their
possible extension when reducing the slit width:
slit width [mm]
>6
5
4
3
2
1
Protect the patient by:
X
• Short illumination times
• Low brightness setting
Switch the light off when interrupting the surgery.
X
It is recommended to adjust the brightness to the minimum
necessary for the surgery.
Infants, patients with aphakia whose eyelens has not been replaced
by an artificial lens with a UV protection screen, small children and
persons with diseases of the eye are at greater risk.
There also is a greater risk if the patient was exposed to the same or
any other ophthalmological instrument using a bright visible light
source within the previous 24 hours. This applies especially if the
eye was examined by retina photography.
The decision about which light intensity to use for an application
must be made on a case-by-case basis. In any case the surgeon has
to make a risk-benefit analysis concerning the applicable
brightness. Despite any effort to minimize the risk of damage to the
retina by the surgical microscope, injuries still might occur.
Photochemical damage to the retina is one possible complication
due to the necessity of using bright light to visualize eye structures
during difficult ophthalmologic processes.
36
time [s]
164
181
233
270
455
909
M844 / Ref. 10 713 294 / Version 01
7.10 Wide-angle observation system
(such as Oculus)
Fit the SDI between the 0° assistant's attachment and tube as
X
pictured (Leica M844 only).
Insert the 7-pin plug of the SDI control cable (10448163) into
X
the OCF socket on the optics carrier.
Insert the 5-pin plug of the SDI power supply cable (10448162)
X
into the CAN socket on the optics carrier.
Screw the BIOM adapter into the underside of the optics carrier.
X
Loosen the clamping screw, slide the BIOM into the guide and
X
retighten the clamping screw.
You can control the wide-angle observation system using
your Leica footswitch by assigning the OCF1, BIOM Focus +
and BIOM Focus – functions in the Extras function group:
Inverter on/off OCF1 pulse
BIOM Focus up BIOM Focus +
BIOM Focus down BIOM Focus –
If you select the "XY Reverse + OCF1" function, the wide-
angle observation system is switched on and, at the same
time, the X and Y movement directions are reversed.
For further information, please see the manufacturer's
operating instructions OCULUS (SDI/BIOM = Trade names of
OCULUS).