O D Solomon1. 1. Department of Ophthalmology, Case Western Reserve School of Medicine, Cleveland, Ohio, USA. info@eyeberspace.com
Abstract
PURPOSE: This study attempted to determine whether the indentation of the cornea with an ultrasonic probe affects the corneal-thickness measurement. METHODS: A solid-tip ultrasonic transducer was mounted into the spring arm of a standard Goldmann Applanation Tonometer. Five human subjects were studied. The visual axis of each cornea was marked with a corneal marker, and the ultrasonic transducer was placed on the visual axis. Corneal-thickness measurements were made during five tension settings of the tonometer: 0, 10, 20, 40, and 80. The R-F signals were received by using a 475 Textronix oscilloscope, and the thicknesses were digitally measured. RESULTS: There was no trend for decreasing or increasing thickness measurements with increasing tension settings. CONCLUSION: Corneal-thickness measurements by ultrasonic pachometry are not significantly affected by corneal indentation with the ultrasonic probe.
PURPOSE: This study attempted to determine whether the indentation of the cornea with an ultrasonic probe affects the corneal-thickness measurement. METHODS: A solid-tip ultrasonic transducer was mounted into the spring arm of a standard Goldmann Applanation Tonometer. Five human subjects were studied. The visual axis of each cornea was marked with a corneal marker, and the ultrasonic transducer was placed on the visual axis. Corneal-thickness measurements were made during five tension settings of the tonometer: 0, 10, 20, 40, and 80. The R-F signals were received by using a 475 Textronix oscilloscope, and the thicknesses were digitally measured. RESULTS: There was no trend for decreasing or increasing thickness measurements with increasing tension settings. CONCLUSION: Corneal-thickness measurements by ultrasonic pachometry are not significantly affected by corneal indentation with the ultrasonic probe.
Authors: Michelle Samuel; Sara M Thomasy; Allison S Calderon; Philip H Kass; Keith Collins; Christopher J Murphy Journal: Vet Ophthalmol Date: 2018-06-21 Impact factor: 1.644
Authors: Tania Paul; Mira Lim; Christopher E Starr; Harriet O Lloyd; D Jackson Coleman; Ronald H Silverman Journal: J Cataract Refract Surg Date: 2008-11 Impact factor: 3.351