| NOMENCLATURE |
ULTRASONIC UNIT, DIAGNOSTIC, OPHTHALMIC. AN ELECTRONIC INSTRUMENT
HAVING AN ULTRASONIC TRANSMITTER AND RECEIVER SYSTEM DESIGNED
SPECIFICALLY FOR OPHTHALMIC DIAGNOSTIC USE. THE INSTRUMENT EMPLOYS
PULSES OF INAUDIBLE HIGH-FREQUENCY, LOW INTENSITY SOUND TO DETECT
BOUNDARIES BETWEEN STRUCTURES OF DIFFERING ACOUSTIC IMPEDANCE IN
TISSUE. ALSO, IT PROVIDES A PRECISE MEASUREMENT OF THE DISTANCE FROM
THE SOUND SOURCETO EACH STRUCTURE DETECTED. ESSENTIAL COMPO NENTS ARE A
TIMER, PULSE GENERATOR, TRANSDUCER, SIGNAL AMPLIFIER, AND A CRT. MAY BE
COMPLETE WITH SCANNER UNIT.
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