Leaf User Manual
P/N: 97-4000, Revision 08, Release date: 2020-11-10 Page 77 of 85
Precautions in Patient Selection
Caution should be taken using this device in patients with the following conditions:
•
Progressive eye disease
•
Fixation difficulty due to nystagmus or have a condition that may induce
nystagmus
•
Infant, aphakia
•
Low intraocular transparency
•
Diabetes
•
Acute primary angle closure (with corneal edema)
•
Late stage glaucoma with progressed visual field loss
Precautions in Photocoagulation
Caution should be taken during photocoagulation to ensure the desired effect is obtained. The
following are recommendations for photocoagulation:
• Clear view of the target tissue:
Corneal opacities, opaque ocular media and vitreous hemorrhage can
interfere with the view of the target structures and may result in damage
adjacent to the target tissue. Treatment should be delayed or an
alternative method of treatment should be implemented.
•
Proper focusing of laser & slit lamp visual and illumination axis
See section “Aligning the Laser to the slit lamp visual and illumination axis” in this
manual for proper parfocality adjustment.
• Energy Density Increase due to spot size reduction
When laser power is constant, the relationship between Spot Size (SS)
and Power Density (PD) can be expressed as:
PD = 1/ SS
2
If the spot size is decreased by half the power density is increased by 4
times. Under this condition excessive photocoagulation may occur. The
system automatically warns the user of a reduction in spot size during
treatment, but it is up to the User to adjust the power appropriately. The
following WARNING appears:
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