July 1972
Volume 11, Issue 7
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Articles  |   July 1972
Constant-Pressure Tonography Based on the Electronic Schiøtz Tonometer
Author Affiliations
  • ROBERT A. MOSES
    Department of Ophthalmology, Washington University School of Medicine, 660 South Euclid, St. Louis, Mo. 63110
  • WALTER J. GRODZKI, Jr.
    Department of Ophthalmology, Washington University School of Medicine, 660 South Euclid, St. Louis, Mo. 63110
Investigative Ophthalmology & Visual Science July 1972, Vol.11, 585-592. doi:
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      ROBERT A. MOSES, WALTER J. GRODZKI; Constant-Pressure Tonography Based on the Electronic Schiøtz Tonometer. Invest. Ophthalmol. Vis. Sci. 1972;11(7):585-592.

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

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Abstract

The design of a constant-pressure tonography device based on the Schiøtz tonometer with a variable-weight plunger is given. In the scale range 7 to 20, the tonometer yielded pressures which were on the average close to the pressure for whichthe instrument was set (25, 30, or 35 mm. Hg) in enucleated human eyes but which had 95 per cent confidence limits of about± 2 mm. Hg for the two lower pressures and about ± 2.7 mm. Hg for the 35 mm. Hg setting. Resistance to outflow measured by the instrument was on the average about 111 per cent of that measured by perfusion, with 95 per cent confidence limits of about 76 to 145 per cent.

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