Tomey OA-2000 - Page 132

■ 4-6
W : Calculated corneal diameter (mm)
= -5.41 + 0.58412LC + 0.098K
LC : Corrected axial length (mm)
L ≦ 24.2 → LC = L
L > 24.2 → LC = -3.446 + 1.716L - 0.0237L
2
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 
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
P : Implanted IOL power (D)
V : Vertex distance (mm)
= 12
na : Aqueous humor and vitreous refractive index
= 1.336
nc : Corneal reflective index
= 1.333
4. Personal A-Constant


aacbbA 2/4
2

Where:
a : 0.62467
2
α
b : 0.62467 {2α (H – 72.083)} +β}
c : α(H – 72.083)
2
+β(H-72.083) + r
α : P (1 – nc) + 0.001P•AREF {V (nc – 1) – r}