Tomey OA-2000 - SRK;T Double K

4-9 ■
AREF: Eye refractive power after surgery (D)
4.1.7 SRK/T Double K
1. Implanted IOL power (D) for emmentropization

YCL
Xna
P
emme
11
1000



2. Implanted IOL power (D) for ametropia






post
post
amet
rCYVREFYCL
rLXVREFXna
P





1001.011
1001.01000
3. Predicted refractive power after surgery (D)





postpost
iol
rCYVCLPrLXVna
CLYPXna
REF






111001.01
111000
Where:
X = na・ｒ
post
– L1 (nc – 1)
Y = na・ｒ
post
– C1 (nc – 1)
L1 : Visual axial length (mm)
= L + (0.65696-0.02029L)
L : Axial length (mm)
C1 : Estimated anterior chamber depth after surgery (mm)
= H + Ofst.
Ofst : Calculated distance from the iris surface to the optical
surface of the implanted IOL (including corneal
thickness) (mm)
= ACD const – 3.336
= (0.62467A – 68.747) - 3.336
H : Height of cornea dome (mm)
4/
22
Wrr
prepre

W : Calculated corneal diameter (mm)
= -5.41 + 0.58412LC + 0.098K
pre
LC : Corrected axial length (mm)
L ≦ 24.2 → LC = L
L > 24.2 → LC = -3.446 + 1.716L - 0.0237L
2
A : A-Constant