Tomey UD-800 User Manual

4-3 ■
4.1.2 Hoffer
®
Q formula
1. Implanted IOL power (D)
1000
05.0336.1
336.1
05.0
1336






C
RK
CL
P
Where:
Rx
Rx
R
012.01

2. Target Ref. after surgery (D) when wearing glasses
R
R
Rx
012.01

Where:
K
C
P
CL
R 





1000
05.0
05.0
1336
336.1
336.1
C : Predicted anterior chamber depth after surgery (ACD)
= X + Y
Where:
X = C1 + 0.3 × (L – 23.5) + (tan K)
2
Y = 0.1M × (23.5 - L)
2
× tan{0.1(G - L)
2
}
- 0.99166
L≦23.0 → M = + 1, G = 28
L > 23.0 → M = - 1, G = 23.5
L > 31.0 → L = 31
L < 18.5 → L = 18.5
P : Implanted IOL power (D)
L : Axial length (mm)
C1 : ACDcon or Personal ACD (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
Rx : Target Ref. after surgery (D) when wearing glasses

Tomey UD-800 Specifications

General

Brand	Tomey
Model	UD-800
Category	Measuring Instruments
Language	English