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January 1967

A New System for Visual Axis Measurements in the Human Eye Using Ultrasound

Author Affiliations

New York
From the Department of Ophthalmology, College of Physicians and Surgeons of Columbia University, New York.

Arch Ophthalmol. 1967;77(1):124-127. doi:10.1001/archopht.1967.00980020126027

An A-scan ultrasound system is described which allows visualization along the ultrasonic path to assure alignment with the patient's visual axis. A special "sound collimator" produces a 2-mm beam from a 10-megacycle transducer which is aimed through a water column and eye cup mounted in such a way as not to cause contact deformation of the globe. Measurements are made from gated portions of the signal with an electronic interval counter and a photographic record is taken.