Shammas-Pl Formula - Tomey UD-800 Instruction Manual

Ultrasonic a/b scanner and pachymeter
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4.1.7 Shammas-PL formula

4-12
This formula is for POST LASIK.
1. Implanted IOL power (D) for emmentropization
P
emme
L
0
2. Implanted IOL power (D) for ametropia
P
amet
L
3. Predicted refractive power after surgery (D)
. 1
REFc
iol
L
: Axial length (mm)
C = pACD = (0.5835 × A) – 64.40
A
: A-Constant
Kc = 1.14 × K – 6.8
K
: Average corneal refractive power (D)
= (K1 + K2)/2
r
: Radius of corneal curvature (mm)
= {(KI –1) × 1000}/K
KI
: Cornea equivalent refractive index
REFc : Refractive power at corneal refractive surface
1000
1000
REF
REF : Target Ref. after surgery (D)
P
: Implanted IOL power (D)
Lc = L–0.1(L–23)
VD
: Vertex distance (mm)
= 12
1336
1 .
L
23
(
C
. 0
05
)
1336
 
0
1 .
L
23
C
. 0
05
0125
1336
1336
1336
Lc
P
C
. 0
VD
1
. 1
0125
C
. 0
05
Kc
1336
1
. 1
0125
C
Kc
REFc
1336
P
Lc
C
. 0
05
05
Lc
C
. 0
05
. 0
05
Kc

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