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Ocular rigidity in tonography

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Summary

Measurement of resistance of the eyeball to distension by combined applanation and Schiøtz tonometry may be seriously contaminated by expulsion of blood. The facility calculation of Moses & Becker (1958) is strongly affected by underestimate of distension resistance.

Measurement of ocular distension resistance by the method of Friedenwald (1937, 1957) is less affected by blood expulsion and is more appropriate to tonography.

A method is proposed to reduce the effect of initial blood expulsion on tonographic calculation.

The results of tonography calculated by the present method are similar to those obtained by the method of Grant (1950).

Résumé

En mesurant la résistance du globe à la distension par une combinaison de la tonométrie d'après Schiøtz avec celle par applanation on risque de faire une erreur due à l'expulsion du sang. Les calculs de la facilité selon Moses & Becker (1958) deviennent ainsi discutables du fait qu'ils sous-estiment la résistance à la distension.

Les mesures faites d'après la méthode de Friedenwald (1937, 1957) sont moins influencées par l'expulsion du sang et de ce fait plus appropriées pour la tonographie. p ]On propose une méthode destinée à réduire l'effet de l'expulsion du sang sur les calculs tonographiques. Les résultats ainsi obtenus sont similaires à ceux que donne la méthode de Grant (1950).

Zusammenfassung

Die Messung des Dehnungswiderstandes des Auges mittels Kombination von Applanations- und Schiøtz-Tonometrie kann durch die Auspressung von Blut wesentlich beeinträchtigt werden. Bei der Berechnung der Abflußfazilität von Moses & Becker (1958) wird damit der Dehnungswiderstand erheblich unterschätzt.

Die Messung des Dehnungswiderstandes nach der Methode von Friedenwald (1937, 1957) ist von der Auspressung von Blut unabhängiger und deshalb geeigneter für die Tonographie.

Es wird eine Methode vorgeschlagen, bei welcher die anfängliche Blutaus-pressung sich auf die tonographische Berechnung weniger auswirkt. Die so erzielten Resultate sind denen der Grant'schen Methode (1950) ähnlich.

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Authors and Affiliations

  1. Department of Ophthalmology, Washington University School of Medicine, USA

    Robert A. Moses & Walter J. Grodzki

Authors
  1. Robert A. Moses
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  2. Walter J. Grodzki
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Additional information

This study was supported by the United States Public Health Service, Nationa Institutes of Health Grant NB04774.

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Moses, R.A., Grodzki, W.J. Ocular rigidity in tonography. Doc Ophthalmol 26, 118–129 (1969). https://doi.org/10.1007/BF00943968

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  • DOI: https://doi.org/10.1007/BF00943968

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