LightLas 532 – Operator's Manual Rev. No 01 Page 26 of 115
All the normal functions of a Slitlamp are available to the operator when using the
LightLas 532 on a Slitlamp unit and when the doctor is using the LIO they will use a
Contact Lens of either 20D or 28D.
On the laser console there is a remote control module that the doctor can remove
from the top of the console and position it close to the treatment location so as to
have easy access to the laser displays and controls. This remote control module is
connected to the laser console by a flexible cable that is coiled up and sits in the
recess area on the top of the laser console.
The doctor must first confirm the patient meets the treatment requirements of the
indications and contraindications before proceeding with any treatment. Typically
the doctors or their assistant will verify that the laser and delivery unit are operating
correctly before positioning the patient in the Chinrest are for avoiding any patient
inconvenience. This checking includes the laser output and alignment.
The doctor must set the laser power and pulse interval whenever the System is
turned on. It is the responsibility of the doctor to set acceptable power levels and
pulse intervals. It is recommended that always start with a lower power and shorter
pulse interval to reduce any risk of unintended injury to the patient. By default
setting the laser system, the power is set to 0mW, the pulse duration is set to 0.02
seconds and the pulse interval is set to “One” which means one shot per requested
only. These settings can be altered and saved by the operators or doctors
preference.
Conversely, the doctor can select a repeat pulse mode where the laser is pulsed
repetitively according to the doctor’s requirements. However, even in this mode, the
laser is always under the control of the doctor’s the footswitch, which means that
whenever the footswitch is released, there will be no laser output.
The following paragraphs give a general description of the operation of the Laser
System
The laser system console generates a controlled beam of the 532nm wavelength light
that is focused to a small spot so that it can be delivered into an optical fiber that
then connects to one of the Delivery units. The Slitlamp LDU’s optical fiber has a
diameter of 200µm and is 2 meters long and 3 meters long for the LIO. Special care
must be taken with the fibers not to damage the jacket as this may create extra
losses and may allow the laser beam to be transmitted at the damaged place along
the fiber. Therefore the fiber should be kept off the floor and away from sharp edges.
The 532nm wavelength green laser light is primarily used as a source of energy to
heat the tissue and thereby cause photocoagulation. The laser beam is directly
applied to the treated tissue and absorbed by the melanin pigment within the retinal
pigment epithelium and the choroid. This absorption converts the light energy into
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