Nomograms
Carriazo-Barraquer (CB) Nomogram & CBSu
Courtesy of Dr. Cezar Carriazo M.D., Colombia
Vacuum Ring Selection
Selection based on K reading in the AXIS of where your HINGE is placed |
Desired OZ |
K<=39 |
39<K<=41 |
41<K<=43 |
43<K<=46 |
46<K |
8.0mm |
0 |
+1 |
+2 |
|
|
8.5mm |
-1 |
0 |
+1 |
+2 |
|
9.0mm |
|
-1 |
0 |
+1 |
+2 |
9.5mm |
H |
|
-1 |
0 |
+1 |
10.0mm |
|
H |
|
-1 |
0 |
10.5mm |
|
|
H |
|
-1 |
|
(Suggested Combinations only-individual patient selection may vary)
H ring must be used with caution-verify OZ with applanator lens. Be aware of the large flap diameters created with the H ring. |
One-Use Plus Nomogram
LSK One-Use Nomogram
Average K |
Ring |
Stop |
Flap OZ |
Stroma Available Ablation |
Hinge Chord Length |
See Below |
38 |
-1 |
7.5 |
8.5 |
8 |
4.0 |
* |
|
|
|
|
|
|
|
39 |
-1 |
7.5 |
8.75 |
8.13 |
4.5 |
* |
|
|
|
|
|
|
|
40 |
-1 |
7.5 |
9 |
8.25 |
5.0 |
|
|
|
|
|
|
|
|
41 |
-1 |
7.75 |
9.25 |
8.5 |
5.0 |
|
|
0 |
7.5 |
8.75 |
8.125 |
4.5 |
|
|
|
|
|
|
|
|
42 |
-1 |
8 |
9.5 |
8.75 |
5.1 |
|
|
0 |
7.5 |
9 |
8.25 |
5.0 |
|
|
|
|
|
|
|
|
43 |
-1 |
8.25 |
9.75 |
9 |
5.2 |
|
|
0 |
7.75 |
9.25 |
8.5 |
5.0 |
|
|
|
|
|
|
|
|
44 |
-1 |
8.5 |
10 |
9.25 |
5.3 |
** |
|
0 |
8 |
9.5 |
8.75 |
5.1 |
|
|
|
|
|
|
|
|
45 |
-1 |
8.75 |
10.25 |
9.5 |
5.3 |
** |
|
0 |
8.25 |
9.75 |
9 |
5.2 |
|
|
|
|
|
|
|
|
46 |
0 |
8.25 |
9.75 |
9 |
5.2 |
|
|
|
|
|
|
|
|
47 |
0 |
8.5 |
10 |
9.25 |
5.3 |
** |
|
|
|
|
|
|
|
48 |
0 |
8.75 |
10.25 |
9.5 |
5.3 |
** |
|
* Caution – small hinge. *Corneas > 12mm may decrease flap by .25mm
** Caution of corneas < 11.0mm. Lubricate well and make slower pass. |
Notes: Determine your Average K, then select appropriate ring and stop position.
For corneas greater than 11.5mm in diameter, OZ size will decrease by .25mm.
For corneas less than 11.0mm in diameter, OZ size will increase by .25mm.
Suggested combinations only – individual patient selection may vary! |
LSK One Nomogram
Courtesy of Dr. Michael Belin M.D., Albany NY
Vacuum Ring And Stop Ring Selection
Selection based on HORIZONTAL K reading |
Desired OZ |
K<=39 |
39<K<=41 |
41<K<=43 |
43<K<=46 |
46<K |
8.0mm |
-1/7.0 |
0/7.0 |
+1/7.0 |
+2/7.0 |
N/A |
8.5mm |
0/7.0 |
+1/7.0 |
+2/7.0 |
N/A |
N/A |
9.0mm |
|
-1/7.5 |
0/7.5 |
+1/7.5 |
+2/7.5 |
9.5mm |
H/8.0 |
|
-1/8.0 |
0/8.0 |
+1/8.0 |
10.0mm |
|
H/8.5 |
|
-1/8.5 |
0/8.5 |
10.5mm |
|
|
H/9.0 |
|
-1/9.0 |
|
