Tomey UD-8000 User Manual

4-5 ■
4.1.3 HOLLADAY formula
1. Implanted IOL power (D)
()
{
}
() (){}
[] SFCrYVREFYSFCL
rLXVREFXna
P
++⋅−−−
⋅+⋅
−
=
2001.022
2001.01000
2. Predicted refractive power after surgery (D)
() (){}
SFCrYVQPrLXVna
YQPXna
REF
iol
++⋅⋅−⋅+⋅
⋅⋅
−
⋅
=
2001.02
1000
Where:
X : na・r – L2 (nc – 1)
Y : na･r - (nc - 1)(C2 + SF)
Q : L2 – C2 -SF
na : Aqueous humor and refractive index of
vitreous
= 1.336
nc : Corneal reflective index
= 4/3
L : Axial length (mm)
K : Average corneal refractive power (D)
= (K1 + K2)/2
r : Radius of corneal curvature (mm)
= {(KI - 1) × 1000}/K
KI : Cornea equivalent refractive index
SF : Distance from the iris surface to the
optical center of the implanted IOL (mm)
REF : Desired refractive power after surgery (D)
V : Vertex distance (mm)
= 12
P : Implanted IOL power (D)
L2 : Corrected axial length (mm)
= L + 0.2
C2 : Anatomic anterior chamber depth;
distance from the corneal vertex to the iris

Tomey UD-8000 Specifications

General

Brand	Tomey
Model	UD-8000
Category	Medical Equipment
Language	English