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PRINCIPLES OF TONOMETER STANDARDIZATION

PRINCIPLES OF TONOMETER STANDARDIZATION Abstract The errors in tonometry arise from three principal sources. The first is entirely within the instrument, which may furnish wrong data owing to poor construction. The second involves the examiner who obtains inaccurate results from a good instrument because of faulty application or inaccurate reading. The third occurs because, although the results may be as good as possible, their quantitative interpretation is wrong owing to misconceptions of the principles involved. This paper is concerned only with the first source of tonometric errors, the apparatus itself, in its most widely used form, i. e., the Schiøtz tonometer.1 The accuracy demanded of any tonometer has two aspects. Priestley Smith2 formulated the distinction with his customary insight : 1. With what degree of accuracy can one measure the impressibility of the eye? 2. With what degree of accuracy does the impressibility indicate the intraocular pressure? The kind of accuracy with which this References 1. Dr. Parker Heath suggested this study and guided its prosecution. 2. Smith, P.: Ophth. Rev. 34:65, 1915. 3. Harrington, D. O., and Parsons, A. H.: Tonometric Standardization: Method of Increasing Accuracy of Tonometry , Arch. Ophth. 26:859 ( (Nov.) ) 1941.Crossref 4. Schiøtz, H.: Brit. J. Ophth. 4:201 ( (May) ) 1920.Crossref 5. Reese, A. B.: Am. J. Ophth. 25:478 ( (April) ) 1942. 6. Arnold, G., and Karpow, C.: Klin. Monatsbl. f. Augenh. 71:603; 1923. 7. Comberg, W.: Ber. ü. d. Versamml. d. deutsch. ophth. Gesellsch. 43:303, 1922 8. Klin. Monatsbl. f. Augenh. 79:364, 1927. 9. Ferree, C. E., and Rand, G.: Checking Standard for Tonometers , Arch. Ophth. 6:689 ( (Nov.) ) 1931.Crossref 10. Adler, F. H.; Berner, G. E., and Meyer, G. P.: Report of the Subcommittee on the Standardization of Tonometers , Tr. Sect. Ophth., A. M. A. , 1934, p. 321 11. Instrument for the Standardization of Tonometers , Adler Tr. Sect. Ophth., A. M. A. 1934, p. 328. 12. Friedenwald, J. S.: Am. J. Ophth. 20:985 ( (Oct.) ) 1937. 13. Schiøtz, H.: Acta ophth. 2:1, 1924.Crossref http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Archives of Ophthalmology American Medical Association

PRINCIPLES OF TONOMETER STANDARDIZATION

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Publisher
American Medical Association
Copyright
Copyright © 1943 American Medical Association. All Rights Reserved.
ISSN
0003-9950
eISSN
1538-3687
DOI
10.1001/archopht.1943.00880170102010
Publisher site
See Article on Publisher Site

Abstract

Abstract The errors in tonometry arise from three principal sources. The first is entirely within the instrument, which may furnish wrong data owing to poor construction. The second involves the examiner who obtains inaccurate results from a good instrument because of faulty application or inaccurate reading. The third occurs because, although the results may be as good as possible, their quantitative interpretation is wrong owing to misconceptions of the principles involved. This paper is concerned only with the first source of tonometric errors, the apparatus itself, in its most widely used form, i. e., the Schiøtz tonometer.1 The accuracy demanded of any tonometer has two aspects. Priestley Smith2 formulated the distinction with his customary insight : 1. With what degree of accuracy can one measure the impressibility of the eye? 2. With what degree of accuracy does the impressibility indicate the intraocular pressure? The kind of accuracy with which this References 1. Dr. Parker Heath suggested this study and guided its prosecution. 2. Smith, P.: Ophth. Rev. 34:65, 1915. 3. Harrington, D. O., and Parsons, A. H.: Tonometric Standardization: Method of Increasing Accuracy of Tonometry , Arch. Ophth. 26:859 ( (Nov.) ) 1941.Crossref 4. Schiøtz, H.: Brit. J. Ophth. 4:201 ( (May) ) 1920.Crossref 5. Reese, A. B.: Am. J. Ophth. 25:478 ( (April) ) 1942. 6. Arnold, G., and Karpow, C.: Klin. Monatsbl. f. Augenh. 71:603; 1923. 7. Comberg, W.: Ber. ü. d. Versamml. d. deutsch. ophth. Gesellsch. 43:303, 1922 8. Klin. Monatsbl. f. Augenh. 79:364, 1927. 9. Ferree, C. E., and Rand, G.: Checking Standard for Tonometers , Arch. Ophth. 6:689 ( (Nov.) ) 1931.Crossref 10. Adler, F. H.; Berner, G. E., and Meyer, G. P.: Report of the Subcommittee on the Standardization of Tonometers , Tr. Sect. Ophth., A. M. A. , 1934, p. 321 11. Instrument for the Standardization of Tonometers , Adler Tr. Sect. Ophth., A. M. A. 1934, p. 328. 12. Friedenwald, J. S.: Am. J. Ophth. 20:985 ( (Oct.) ) 1937. 13. Schiøtz, H.: Acta ophth. 2:1, 1924.Crossref

Journal

Archives of OphthalmologyAmerican Medical Association

Published: May 1, 1943

References