25
Clinical & Safety
13102C-EN
Treating patients with a localized vitreous hemorrhage
The prismatic effect of the lens and use of scleral depression may assist in
moving vitreous hemorrhage out of the way or pushing untreated retina
into the view of the laser beam. The 810 nm (infrared) wavelength
penetrates vitreous hemorrhage better than the 514-532 nm (green)
wavelengths.
Treating patients with a scleral buckle
The thickness of the scleral buckle allows conventional transconjunctival
cryotherapy. The peripheral buckle may also be difficult to reach with slit
lamp delivery.
Treating patients with small pupils
Patients with small pupils and particularly those with media opacities are
difficult to treat with a slit lamp. Better visualization through a small pupil
may be obtained with the TruFocus LIO+ and an appropriate choice of
auxiliary lens.
Treatment considerations
Positioning
Place the patient in a supine position. Position your head (T
ruFocus LIO+)
approximately 37 to 50 cm (15 to 20 in) from the patient’
s eye. Direct the
white illumination light and the red aiming beam into the patient’
s eye.
Hold the aspheric lens (laser coated) with the white ring side toward the
patient so that the patient’s pupil is centered in the lens. Adjust the
position of the lens until a clear image of the retina fills the area of the
lens. A 20-diopter (20D) aspheric lens is most commonly used for laser
indirect ophthalmoscopy. This provides an aperture of 51 mm and 45
°
retinal field of view.
