CAIRS Planning Calculator

Plan donor segments and host ring laser settings for iFS.

Inputs

Laterality
Desired Optic Zonemm · typical 4.0–6.5
CAIRS Widthmm · typical 0.7–1.5
Arc Lengthdegrees · typical 100–360
Temporal-most Axis of Implantationdegrees 0–360

Example — OS (Left)

Example of temporal-most axis of implantation on OS corneal topography
Thinnest Host Pachymetry at mid-OZµm · caution < 350
Oversize Channel Bymm · 0.05–0.20
Full Thickness Minusµm · IEK depth margin

Resultant settings for IEK

Ring Lamellar Cut

ONFULL
Depth In Cornea
100
Outer Diameter
5.9
Inner Diameter
4.3
Energy
2.5
Spiral Start
INOUT

Posterior Side Cut

ON
Anterior Depth
90
Posterior Depth
800
Diameter
5.6
Energy
2.5
Side Cut Angle
90

Anterior Side Cut

ON
Posterior Depth
800
Diameter
4.2
Energy
2.5
Cut Position 1
0
Cut Angle 1
360
Cut Position 2
180
Cut Angle 2
0
Side Cut Angle
90

Alignment Incisions

OFF
Incisions
481216
Depth In Glass
25
Posterior Depth
25
Energy
4
Length
1000
Width
1
Radial Offset
+2

Cut donor segment, then trim to your specified width and arc length.

Resultant Ring Procedure Settings

Depth In Cornea
250
Inner Diameter
4.2
Outer Diameter
5.8
Entry Cut Length
1.1
Entry Cut Thickness
1
Incision Axis
0
Ring Energy
1.30
Entry Cut Energy
1.30
50% depth (min 250)
oversize is added to the outer diameter
incision is always oversized
incision is 15 degrees away

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