June 1968
Volume 7, Issue 3
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Articles  |   June 1968
Some Basic Statistics of Clinical Tonography
Author Affiliations
  • PETER C. KRONFELD
    Department of Ophthalmology, The University of Illinois, College of Medicine Chicago, Ill. 60612
Investigative Ophthalmology & Visual Science June 1968, Vol.7, 319-327. doi:
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      PETER C. KRONFELD; Some Basic Statistics of Clinical Tonography. Invest. Ophthalmol. Vis. Sci. 1968;7(3):319-327.

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      © ARVO (1962-2015); The Authors (2016-present)

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Abstract

Measures of the test-retest consistency of tonographic outflow facility measurements are derived from replicate tests on outpatients with ocular hypertension or chronic open-angle glaucoma. Standard deviations of about ±0.02 apply to such repeat tonographies performed at specific test-times. Recognizable components of this variation are (1) uncertainties inherent in the tonographic tracing and (2) parallel, genuine fluctuations of C in both eyes, steered, apparently, by an extraocular common mechanism. Evidence suggestive of a decrease in facility at higher pressures is reported. A five-minute interval between the tonographies on the two eyes reduces consensual or sequence effects to the level of clinical insignificance. A substantial calibration discrepancy exists between the 5.5 and the 7.5 Gm. scales.

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