Tomey UD-600, Operator'S Manual, Page: 193 / 262

4-1
4. REFERENCES FOR TECHNICAL INFOR-
MATION
4.1 Calculation method of axial length by biometry
sub-function
„ „
„ „ „ Normal / Dense Cataract / Aphakic
The measured values are calculated with the average sound
velocity for axial length, by using the following calculation for-
mula.
L = V· t/2
L: Measured axial length
V: Sound velocity for axial length
t:
Time from transmitting to receiving ultrasound echo
„ „ „ „ „ Pseudophakic
Measured values are calculated by the following equation.
Lp = L+ Th (1-1532/Vi)
Lp: Measured axial length
L: Axial length calculated with the biometric ultrasound velocity
(axial length in an Aphakic case)
Th: Central thickness of IOL (User's input)
Vi: Sound velocity of IOL (User's input)
4.1 Calculation method of axial length by biometry sub-function