Tomey UD-800 User Manual

4-1 ■
4. TECHNICAL INFORMATION
4.1 IOL power calculation formula
4.1.1 Haigis optimized / Haigis Standard
1. Implanted IOL power (D)
1000
1000
d
z
na
na
dL
na
P




Where:
1000
1
VREF
REF
DCZ



d = a0 + a1•ACD + a2•L (ACD ≠ 0)
d =(a0 – 0.241•a1) + (a2 + 0.139•a1)L (ACD = 0)
a0 = 0.62467A – 72.434···*
 
RC
nc
DC
11000 

2. Estimated refractive power after surgery (D)
 
 
XXDCYV
XDCY
REF
iol
10001000
10001000



Where:
X = d
2
•P + 1000L•na - d•L•P
Y = na (1000•na-L•P + d•P)
na : Aqueous humor and vitreous refractive index
= 1.336
nc : Corneal reflective index
= 1.3315
A : A-Constant
RC : A verage radius of corneal curvature (mm)
= (r1 + r2)/2
r : Radius of corneal curvature (mm)
= {(KI - 1) × 1000}/K
K : Corneal refractive power (D)
KI : Cornea equivalent refractive index
DC : Average corneal refractive power (D)

Tomey UD-800 Specifications

General

Brand	Tomey
Model	UD-800
Category	Measuring Instruments
Language	English