Tomey AL-100 User Manual

4-3
4.1.2 SRK/T
a. Emmetropic IOL power (D)
P
emmme =
1000na xX
(L1 - C1) Y
b. Ametropic IOL power (D)
P
ame t =
1000na {X - 0.001REF (VxX + L1xr)}
(L1 - C1) {Y - 0.001REF (VxY + C1xr)}
c. Desired postoperative refraction (D)
REF
iol =
1000naxX - PxY (L1 - C1)}
na (V x X + L1 x r) - 0.001P (L1 - C1) (V x Y + C1 x r)
Where:
X = naxr - L1 (nc - 1)
Y = naxr - C1 (nc - 1)
L1: Optical axial length (mm) = L + (0.65696 - 0.02029L)
L: Measured axial length (mm)
REF: Desired postoperative refraction (D)
r: Average corneal radius of curvature (mm) = 337.5/K
W: Corneal thickness by calculation (mm)
= -5.41 + 0.58412LC + 0.098K
LC: Modified axial length (mm)
if L  24.2, then LC = L
if L > 24.2, then LC = -3.446 + 1.716L - 0.0237L
2
C1: Estimated postoperative anterior chamber depth (mm)
= H + Ofst.
Ofst: Calculated distance between the iris surface and IOL
optical surface
(including the corneal thickness) (mm)
= ACD const = -3.336
= (0.62467A - 68.747) - 3.336
H: Height of the corneal dome (mm)
= r - SQRT r
2
- W
2
/4
A: A-constant
K: Average corneal refractive power (D)
=(K1 + K2)/2
P: Power of IOL implant (D)
V: Vertex distance (mm) = 12
na: Refractive index of aqueous and vitreous = 1.336
nc: Refractive index of cornea = 1.333

Tomey AL-100 Specifications

General

Brand	Tomey
Model	AL-100
Category	Measuring Instruments
Language	English