Tomey AL-2000 - Page 12

AL-2000 Biometer & Pachymeter
3
11..33 OOuuttlliinnee ooff OOppeerraattiioonn
11..33 OOuuttlliinnee ooff OOppeerraattiioonn
The AL-2000 is an ultrasound instrument designed for measuring the axial length of the eye and
the thickness of the cornea for medical ophthalmic use.
••
Ultrasound energy is emitted from the probe tip. The probe acts as both the transmitter
and receiver of ultrasound energy.
••
Some of the energy is reflected back toward the probe in the form of echoes. Measurement
data can be calculated based on the time it takes the echoes to travel back to the probe
from the eye and the preset converted velocity.
••
The time from the echo for the corneal epithelium to the echo for a measuring object is
measured. The length of a biological object is calculated using a set conversion value for
the speed of sound.
L = V x t/2
where L = length of the biological object
V = converted sound speed
t = measuring time
••
The axial length and corneal thickness measurement are acquired automatically and do not
depend on the operator's experience and capability.
••
IOL power calculation can be performed immediately after measuring the axial length. Six
standard IOL formulae are provided.
••
The instrument can store axial length, corneal curvature and implanted IOL data, on the
basis of which personal lens constants may be determined.
11..44 SSooffttwwaarree VVeerrssiioonn
The version of the installed software appears on the monitor when the instrument is turned on.