March 1971
Volume 10, Issue 3
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Articles  |   March 1971
Applanation and Schiøtz Tonometer Standardizations for the Owl Monkey Eye with a New Technique for Measuring Episcleral Venous Pressure
Author Affiliations
  • JAMES L. MINIS, III
    Department of Ophthalmology, Tulane University School of Medicine, New Orleans, La.
  • MONTE G. HOLLAND
    Department of Ophthalmology, Tulane University School of Medicine, New Orleans, La.
Investigative Ophthalmology & Visual Science March 1971, Vol.10, 190-197. doi:
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      JAMES L. MINIS, MONTE G. HOLLAND; Applanation and Schiøtz Tonometer Standardizations for the Owl Monkey Eye with a New Technique for Measuring Episcleral Venous Pressure. Invest. Ophthalmol. Vis. Sci. 1971;10(3):190-197.

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

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Abstract

A Schiøtz Pt calibration by open manometer was performed on 18 owl monkey eyes cannulated in situ. Pt values for the owl monkey corresponded closely to those of the 1955 Friedenwald nomogram. The average ocular rigidity measured in 16 additional eyes with the use of clinical techniques was 0.0173 (± 0.0015). A manometric calibration for a 4 mm. diameter applanation face was done similarly on 21 eyes. The following standardization formula was generated:

Pressure in mm. Hg = 0.641 (tonometric scale reading) + 2.56 mm. Hg.

An attempt was made to compare the two tonometric pressure standardizations. In 16 intact eyes, Schiøtz Po pressures, corrected for ocular rigidity, averaged 0.77 ± 0.47 mm. Hg higher than corresponding applanation pressures. An improved method for measuring episcleral venous pressure, with the use of a new synthetic polyurethane pressure chamber membrane, is also reported.

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