Tomey OA-2000 - Holladay 1

■ 4-4
4.1.3 Holladay 1
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 vitreous refractive index
= 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 : Target Ref. 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 surface (mm)
= 0.56 + Rag –
4/
22
AGRag 
r < 7 → Rag = 7
r ≧ 7 → Rag = r
AG = 12.5L / 23.45
AG > 13.5 → AG = 13.5