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A Review of the Sonometrics DBR Unit and the Binkhorst Formula

A Review of the Sonometrics DBR Unit and the Binkhorst Formula This article is only available in the PDF format. Download the PDF to view the article, as well as its associated figures and tables. Abstract To the Editor. —I found it difficult to determine from Dr Hoffer's article the objective criteria for instrument evaluation that he used. There are four major parts to the ultrasonic measurement that affect the result—the instrument, the transducer and its application, the formula for calculation, and the precision or accuracy of the measurement system. Hoffer presented his preferences for instruments, transducers, and formulas without demonstrating objective comparisons with all other factors controlled.The implication is that examination with a lower-frequency, nonfocused transducer and caliper measurement from photographs is more accurate than using a higher-frequency, focused beam transducer with electronic interval calculation averaging. This perception is contrary to physical principles.Certainly the choice of a transducer stand off or eye cup is an option available to the user of any instrument and hardly merits favoring one instrument over another.It is disappointing that the Archives would support Hoffer's unsubstantiated endorsement http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Archives of Ophthalmology American Medical Association

A Review of the Sonometrics DBR Unit and the Binkhorst Formula

Archives of Ophthalmology , Volume 100 (10) – Oct 1, 1982

A Review of the Sonometrics DBR Unit and the Binkhorst Formula

Abstract

This article is only available in the PDF format. Download the PDF to view the article, as well as its associated figures and tables. Abstract To the Editor. —I found it difficult to determine from Dr Hoffer's article the objective criteria for instrument evaluation that he used. There are four major parts to the ultrasonic measurement that affect the result—the instrument, the transducer and its application, the formula for calculation, and the precision or accuracy of the...
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Publisher
American Medical Association
Copyright
Copyright © 1982 American Medical Association. All Rights Reserved.
ISSN
0003-9950
eISSN
1538-3687
DOI
10.1001/archopht.1982.01030040654023
Publisher site
See Article on Publisher Site

Abstract

This article is only available in the PDF format. Download the PDF to view the article, as well as its associated figures and tables. Abstract To the Editor. —I found it difficult to determine from Dr Hoffer's article the objective criteria for instrument evaluation that he used. There are four major parts to the ultrasonic measurement that affect the result—the instrument, the transducer and its application, the formula for calculation, and the precision or accuracy of the measurement system. Hoffer presented his preferences for instruments, transducers, and formulas without demonstrating objective comparisons with all other factors controlled.The implication is that examination with a lower-frequency, nonfocused transducer and caliper measurement from photographs is more accurate than using a higher-frequency, focused beam transducer with electronic interval calculation averaging. This perception is contrary to physical principles.Certainly the choice of a transducer stand off or eye cup is an option available to the user of any instrument and hardly merits favoring one instrument over another.It is disappointing that the Archives would support Hoffer's unsubstantiated endorsement

Journal

Archives of OphthalmologyAmerican Medical Association

Published: Oct 1, 1982

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