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Schiotz and Applanation Tonometry

Schiotz and Applanation Tonometry Abstract In preceding publications,1,2 it was shown that, when a large population of normal eyes was examined by applanation and Schiotz tonometry, the agreement between the value of the arithmetic averages, obtained by the two systems of measurement, was not reflected in measurements obtained in the individual eye. Significant difference in estimates of intraocular pressure of the same eye, obtained by the two methods, was shown to occur with an undesirably high frequency in the clinically important range of intraocular pressure. Further analysis showed that the difference between the two systems was systematic in nature, and could account for significant clinical and experimental error when the two systems are used interchangeably, such as in calculating the coefficient of ocular rigidity, E, and using it to correct the tonographic estimate of outflow facility, C.2 With the advent of applanation tonometry, which is virtually independent of ocular rigidity, Goldmann6 proposed References 1. Armaly, M. F.: Schiotz Tonometer Calibration and Applanation Tonometry , Arch Ophthal 64:426, 1960.Crossref 2. Armaly, M. F.: The Des Moines Population Study of Glaucoma , Invest Ophthal 1:618, 1962. 3. Armaly, M. F.: The Consistency of the 1955 Calibration for Various Tonometer Weights , Amer J Ophthal 48:602 (Nov, (pt 2) ) 1959. 4. Armaly, M. F.: On the Consistency of Tonography, submitted for publication in J Invest Ophthal. 5. Friedenwald, J. S.: Tonometer Calibration: An Attempt to Remove Discrepancies Found in the 1954 Calibration Scale for Schiøtz Tonometers , Trans Amer Acad Ophthal 61:108, 1957. 6. Goldmann, H.: " Applanation Tonometry ," in Glaucoma, Transactions of the Second Conference , New York: Josiah Macy, Jr., Foundation, 1957. 7. Linnér,: Episcleral Venous Pressure During Tonography , Acta XVII Conc Ophthal (1954) 3:1532, 1955. 8. Linnér, E.: The Outflow Pressure in Normal and Glaucomatous Eyes , Acta Ophthal (Kobenhavn) 33:101, 1955.Crossref 9. Moses, R. A., and Becker, B.: Clinical Tonography: The Scleral Rigidity Correction , Amer J Ophthal 45:169, 1958. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Archives of Ophthalmology American Medical Association

Schiotz and Applanation Tonometry

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References (8)

Publisher
American Medical Association
Copyright
Copyright © 1963 American Medical Association. All Rights Reserved.
ISSN
0003-9950
eISSN
1538-3687
DOI
10.1001/archopht.1963.00960050605005
Publisher site
See Article on Publisher Site

Abstract

Abstract In preceding publications,1,2 it was shown that, when a large population of normal eyes was examined by applanation and Schiotz tonometry, the agreement between the value of the arithmetic averages, obtained by the two systems of measurement, was not reflected in measurements obtained in the individual eye. Significant difference in estimates of intraocular pressure of the same eye, obtained by the two methods, was shown to occur with an undesirably high frequency in the clinically important range of intraocular pressure. Further analysis showed that the difference between the two systems was systematic in nature, and could account for significant clinical and experimental error when the two systems are used interchangeably, such as in calculating the coefficient of ocular rigidity, E, and using it to correct the tonographic estimate of outflow facility, C.2 With the advent of applanation tonometry, which is virtually independent of ocular rigidity, Goldmann6 proposed References 1. Armaly, M. F.: Schiotz Tonometer Calibration and Applanation Tonometry , Arch Ophthal 64:426, 1960.Crossref 2. Armaly, M. F.: The Des Moines Population Study of Glaucoma , Invest Ophthal 1:618, 1962. 3. Armaly, M. F.: The Consistency of the 1955 Calibration for Various Tonometer Weights , Amer J Ophthal 48:602 (Nov, (pt 2) ) 1959. 4. Armaly, M. F.: On the Consistency of Tonography, submitted for publication in J Invest Ophthal. 5. Friedenwald, J. S.: Tonometer Calibration: An Attempt to Remove Discrepancies Found in the 1954 Calibration Scale for Schiøtz Tonometers , Trans Amer Acad Ophthal 61:108, 1957. 6. Goldmann, H.: " Applanation Tonometry ," in Glaucoma, Transactions of the Second Conference , New York: Josiah Macy, Jr., Foundation, 1957. 7. Linnér,: Episcleral Venous Pressure During Tonography , Acta XVII Conc Ophthal (1954) 3:1532, 1955. 8. Linnér, E.: The Outflow Pressure in Normal and Glaucomatous Eyes , Acta Ophthal (Kobenhavn) 33:101, 1955.Crossref 9. Moses, R. A., and Becker, B.: Clinical Tonography: The Scleral Rigidity Correction , Amer J Ophthal 45:169, 1958.

Journal

Archives of OphthalmologyAmerican Medical Association

Published: Nov 1, 1963

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