Tomey UD-8000 - Technical Information; IOL Power Calculation Formula; SRK-II Formula

4-1 ■
4. TECHNICAL INFORMATION
4.1 IOL power calculation formula
4.1.1 SRK-II formula
1. Implanted IOL power (D) for emmentropization
LKAPemme 5.29.01
−
−
=
2. Implanted IOL power (D) for ametropia
CRREFPP emmeamet
⋅
−
=
3. Predicted refractive power after surgery (D)
(
)
CRPPREF emmeiol /
−
=
Where:
L<20.0 → A1 = A +3
20.0 ≤ L < 21.0 → A1 = A +2
21.0 ≤ L < 22.0 → A1 = A +1
22.0 ≤ L < 24.5 → A1 = A
24.5 ≤ L → A1 = A – 0.5
emmeP
≤ 14 → CR = 1.00
emmeP
> 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 : Desired refractive power after surgery