Tomey UD-800 User Manual

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4.1.5 SRK/T formula
1. Implanted IOL power (D) for emmentropization
 
YCL
Xna
Pemme
11
1000



2. Implanted IOL power (D) for ametropia
  
    
rCYVREFYCL
rLXVREFXna
Pamet



1001.011
1001.01000
3. Predicted refractive power after surgery (D)
 
    
rCYVCLPrLXVna
CLYPXna
REFiol



111001.01
111000
Where:
X = na•r – L1 (nc – 1)
Y = na•r – C1 (nc – 1)
L1 : Visual axial length (mm)
= L + (0.65696 – 0.02029L)
L : Axial length (mm)
REF : Target Ref. after surgery (D)
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

Tomey UD-800 Specifications

General

Brand	Tomey
Model	UD-800
Category	Measuring Instruments
Language	English