29
Clinical & Safety
13102C-EN
Repeat interval
Placing multiple treatment spots on the fundus is more easily
accomplished utilizing the console’s repeat mode. This eliminates
constant foot pedal action that is very awkward, especially in a standing
position while the surgeon attempts to avoid head motion.
Use of the repeat interval may be less desirable in the air-filled phakic eye
where there is a tendency toward smaller, potentially more dangerous spot
sizes. Patients who have undergone retinal reattachment with an
intraoperative air-fluid exchange may still have trapped pockets of
subretinal fluid that can affect size and shape of the burns and can cause
additional problems.
The time required between pulses should allow enough time for the
surgeon to move the laser beam to another location. Laser spot placement
that is done too rapidly can lead to inaccuracies in placement of the
lesions. A repeat interval of 300 ms to 500 ms seems ideal.
Red aiming and treatment beams
Since the red aiming beam and the treatment beam come to focus at the
same optical point, ensure that the aiming beam is always in sharp focus
during laser delivery. An out-of-focus spot may not produce a clinically
satisfactory lesion.
REFERENCE
See the
Adjusting the
Illuminating Light and
Aiming Beam
section of
this manual for proper
focusing and set up
procedures.
