Srk-Ii Formula - Tomey UD-800 Instruction Manual

4.1.4 SRK-II formula

1. Implanted IOL power (D) for emmentropization
 
P A 1 0 9 . K
emme
2. Implanted IOL power (D) for ametropia
 
P P REF
amet emme
3. Predicted refractive power after surgery (D)


REF P
iol emme
Where:
L<20.0
20.0≦L < 21.0
21.0≦L < 22.0
22.0≦L < 24.5
24.5≦L
P
emme
≦14 -> CR = 1.00
P
emme > 14 -> CR = 1.25
A : A-Constant
K : Average corneal refractive power (D)
= (K1 + K2)/2
r : Radius of corneal curvature (mm)
= {(KI - 1) × 1000}/K
KI : Cornea equivalent refractive index
L : Axial length (mm)
P : Implanted IOL power (D)
REF : Target Ref. after surgery

2 5 . L

CR


P / CR
→ A1 = A +3
→ A1 = A +2
→ A1 = A +1
→ A1 = A
→ A1 = A – 0.5
4-7 ■