Tomey UD-600, Operator'S Manual

Page: 203 / 262

4-11
4.3.5 HAIGIS optimized / HAIGIS Standard
1. Implanted IOL power (D)
Where,
d=a0+a1 ·ACD+a2 ·L (ACD
g
0)
d=(a0-0.241·a1)+(a2+0.139·a1)L (ACD = 0)
a0=0.62467A-72.434 -------*
2. Post surgery expected refractive power (D)
Where,
X=d2·P+1000L·na-d·L·P
Y=na(1000·na - L·P+d·P)
na:
Refractive index of aqueous and vitreous body
=1.336
nc: Corneal refractive index =1.3315
A: A-Constant
RC: Average corneal curvature (mm)
=(K1+K2)/2
DC: Average corneal refractive power (D)
L: Axial length (mm)
ACD: Anterior chamber depth (mm)
REF: Post surgery expected refractive power (D)
V:
Vertex distance (mm) = 12
P: Implanted IOL power (D)
a1: 0.4 -------*
a2: 0.1 -------*
* The HAIGIS optimized formula calculates with the use of
registered a0, a1,and a2.
1000na na
P = ———— - ———————
L - D
na d
—— - ———
Z 1000
REF
Z = DC + ———————
REF·V
1 - ———
1000
1000(nc - 1)
DC= —————
RC
1000(1000Y-DC·X)
REF
iol
= ————————————
V(1000Y - DC ·X) + 1000X
4.3 IOL power calculation