Srk/T Double K - Tomey UD-800 Instruction Manual

4.1.8 SRK/T Double K

■ 4-14
■ This formula is for POST LASIK.
1. Implanted IOL power (D) for emmentropization

P
emme
2. Implanted IOL power (D) for ametropia
1000

P
amet 
L
3. Predicted refractive power after surgery (D)

REF
iol
na
Where:
X = na•r
post
Y = na•r
post
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)

r
pre
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
A : A-Constant

1000 na X
 

L 1 C 1 Y


na X 0 . 001 REF


 
1 C 1 Y 0 . 001 REF
 
1000 na X P
 
   
V X L 1 r . 0 001 P
post
– L1 (nc – 1)
– C1 (nc – 1)
 
2 2
r W / 4
pre
  
  
V X L 1 r
post
  
  
V Y C 1 r
post
 
 
Y L 1 C 1
 
 
   
L 1 C 1 V Y C 1 r
post
2