Tomey AL-4000 User Manual

䕔 4-6
4.1.4 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. Desired refractive power 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䍺23.0 䊻 M = + 1䚸G = 28
L > 23.0 䊻 M = - 1䚸G = 23.5
L > 31.0 䊻 L = 31
L < 18.5 䊻 L = 18.5
P : Implanted IOL power (D)
L : Axial length (mm)
C1 : Personal anterior chamber depth (mm)
K : Average corneal refractive power (D)
= (K1 + K2)/2
Rx : Desired refractive power after surgery (D)

Tomey AL-4000 Specifications

General

Brand	Tomey
Model	AL-4000
Category	Measuring Instruments
Language	English