Tomey AL-100 User Manual

4-6
4.1.4 Haigis standard / Haigis optimized
a. IOL power (D)
P =
1000na
-
na
L - d na
-
d
z 1000
Where:
z = DC +
REF
1 -
REF x V
1000
d = a0 + a1xACD + a2xL (ACD = 0)
d = (a0 - 0.241xa1) + (a2 + 0.139xa1)L (ACD = 0)
a0 = 0.62467A - 72.434 ............. (*)
DC =
1000 (nc - 1)
RC
b. Predicted postoperative refractive power (D)
REFiol =
1000 (1000Y - DC x X)
V (1000Y - DC x X) + 1000X
Where:
X = dxP + 1000Lx na - dxLxP
Y = na (1000xna - LxP + dxP)
na: Refractive index of aqueous and vitreous = 1.336
nc: Refractive index of cornea = 1.3315
RC: Average corneal radius of curvature (mm)
= (K1 + K2) / 2
DC: Average corneal refractive power (D)
L: Axial length (mm)
ACD: Anterior chamber depth (mm)
REF: Desired postoperative refractive power (D)
V: Vertex distance (mm) = 12
P: Power of IOL implant (D)
a1: 0.4 (default value) ............. (*)
a2: 0.1 (default value) ............. (*)
(*: Registered a0, a1 and a2 are used by Haigis Optimized.)

Tomey AL-100 Specifications

General

Brand	Tomey
Model	AL-100
Category	Measuring Instruments
Language	English