Hoffer ® Q Formula - Tomey UD-800 Instruction Manual

4.1.2 Hoffer ® Q formula
1. Implanted IOL power (D)
1336

P
 
L C . 0 05
Where:
Rx

R
1 . 0 012 Rx
2. Target Ref. after surgery (D) when wearing glasses
R

Rx
1 . 0 012 R
Where:
. 1

R
. 1 336
1336
 
L C . 0 05
C : Predicted anterior chamber depth after surgery (ACD)
= X + Y
Where:
X = C1 + 0.3 × (L – 23.5) + (tan K)
Y = 0.1M × (23.5 - L)
- 0.99166
L≦23.0
L > 23.0
L > 31.0
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
. 1 336


. 1 336 C . 0 05


K R 1000
336

K

C . 0 05

1000

P
2
2 × tan{0.1(G - L)
→ M = + 1, G = 28
→ M = - 1, G = 23.5
→ L = 31
→ L = 18.5
2 }
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