Overview - Tomey UD-800 Instruction Manual

1.4 Overview

This instrument is designed as an ophthalmology device with functions to retrieve
ultrasound topographic images of living tissues using ultrasound waves
generated from an ultrasound transducer built into the probe, to retrieve A mode
waveforms and to measure axial length and corneal thickness.
B mode image diagnosis function
● From the B mode probe connected to the main unit, images and displays the
tissue of the scanned eyeball cross section generating and scanning
ultrasound waves into the eyeball and using ultrasonic echoes reflected from
each tissue inside the eyeball.
Biometry function
● The measurement probe connected to this instrument transmits ultrasound
waves to the inside of an eyeball and then receives ultrasound echoes
reflected by the tissue boundary surface in the eyeball.
● The time required for the ultrasound wave to be transmitted from the front of
the cornea to the measurement section is measured, and the length of the
living tissue is calculated based on the preset converted acoustic velocity.
● With an IOL power calculation function, this instrument has various IOL
power formulae applicable to ordinary cataract surgery and/or cataract
surgery of eyes with corrected corneal refractive power, and provides data
necessary to determine IOL power.
Pachymetry function
● Function to measure corneal thickness in the same manner as measurement
of axial length
A mode diagnosis
● Function to identify areas with pathocological changes by observing A mode
waveforms
L: Length of living tissue
V: Converted sound speed
t: Measurement time
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