Tomey UD-8000 User Manual

4-13 ■
K
pre
: Average corneal refractive power (D)
before refractive correction surgery
= (K1
pre
+ K2
pre
)/2
r
pre
: Average radius of corneal curvature (mm)
before refractive correction surgery
= {(KI - 1) × 1000}/ K
pre
KI : Cornea equivalent refractive index
K
post
: Average corneal refractive power (D) after
refractive correction surgery
= (K1
pre
+ K2
pre
)/2
r
post
: Average radius of corneal curvature (mm)
after refractive correction surgery
= {(KI - 1) × 1000}/ K
post
P : Implanted IOL power (D)
na : Aqueous humor and refractive index of
vitreous
= 1.336
nc : Corneal reflective index
= 1.333
REF : Desired refractive power after surgery (D)
V : Vertex distance (mm)
= 12
4. Personal A-Constant
(
)
aacbbA 2/4
2
−+−=
Where:
a : 0.624672 a
b : 0.62467 {2a (H – 72.083)} + b}
c : α (H – 72.083)
2
+ β(H-72.083) + γ
α : P (1 – nc) + 0.001P•AREF {V (nc – 1) – r}
β : P [na・r + L1 (nc – 1)
+ 0.001AREF {L1・r + V・L1 (1 – nc) - na・V・r }]
γ : na [1000X – P・L1・r + AREF
{0.001P・V・L1・r – (V・X + L1・r)}]
AREF : Refractive power of eye after surgery (D)

Tomey UD-8000 Specifications

General

Brand	Tomey
Model	UD-8000
Category	Medical Equipment
Language	English