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TruFocus LIO+ Operator Manual
13102C-EN
Using the scleral depressor
The use of the scleral depressor is extremely helpful when treating with
the TruFocus LIO+:
•
The scleral depressor helps stabilize the eye, acting as a ‘splint’ to
inhibit voluntary and involuntary eye movement.
•
The depressor helps to manipulate the eye in various fixations and
helps to flatten residual subretinal fluid.
•
The depressor decreases the thickness of the ocular media by bringing
the retina closer to the front of the eye.
•
The depressor can stretch and ‘thin out’ the choroid to reduce its
cooling effect, contributing to a hotter burn.
•
Since the eye has a curved surface, the depressor can flatten the retina
and manipulate it into a position more perpendicular to the laser
beam. This helps to create a round spot with a more evenly distributed
power density.
Moving the spot
To minimize neck fatigue, move the eye with the depressor while holding
the TruFocus LIO+ steady to move the spot, or shift the handheld
condensing lens. Because the plus (+) lens has a large amount of ‘base-in’
prism, you can move the laser spot with the motion of the handheld lens.
To achieve the largest spot movement, move your head to the desired
position.
Positioning the condensing lens
•
Treat within the central two-thirds of the lens to minimize peripheral
aberrations.
•
There are two specular reflections on the lens corresponding to the
front and back surfaces. To improve visibility within the center of the
lens, tilt the lens to move the two white reflections apart.
•
When treating in the periphery
, the laser spot develops astigmatism
(the spot becomes oval and elongated). To achieve a more round spot,
tilt one edge of the lens toward the patient. Tilting the lens toward the
patient induces compensating astigmatism in the opposite direction.
•
To help guide the laser beam around media opacities and hemorrhage,
move the lens from side-to-side.
