Tomey UD-600, Operator'S Manual

Page: 21 / 262

1-7
1.4.4 Biometry function
y
The probe connected to this instrument transmits ultrasound waves
into the internal part of the eyeball, while the ultrasound echo reflected
from its anatomy will be received by the same probe.
y
The instrument measures the time from the echo for corneal epithelium to
that for the object to be measured, with which the length of the tissues is
calculated by applying the sound velocity for conversion as set.
L = ———
L: Axial length
V: Conversion sound velocity
t: Measured time
y
This instrument provides the automatic measuring function and the
sound monitoring function for the purpose of biometry measure-
ment; therefore, accurate measurement can be obtained regardless
of Physician's experience and capability.
y The instrument provides seven standard IOL power calculation for-
mulas; therefore, calculation can be given immediately after axial
length measurement has been done.
y
The instrument also saves measurement data, corneal radius of cur-
vatures, and implanted IOL data in the memory card. The instru-
ment is also capable of calculating a personal lens constant with
saved data for statistical summation.
V · t
2
1.4 Outline of the operation