An instrument for constant-pressure tonography

Irvin P. Pollack, Lawrence J. Viernstein, Ronald L. Radius

Research output: Contribution to journalArticlepeer-review

4 Scopus citations


A new instrument has been evaluated for performing constant-pressure tonography. The sensor probe, controlled by an electronic servo system, applanates the cornea with sufficient force to maintain a constant intraocular pressure. The rising applied force during the course of the measurement is recorded and used for computing the facility of aqueous outflow. The results of the study show that good statistical separation of glaucoma patients from normals is obtained, and that patients find the procedure to be comfortable. Improvements in the instrument are proposed to enhance its clinical acceptability.

Original languageEnglish (US)
Pages (from-to)579-585
Number of pages7
JournalExperimental eye research
Issue number6
StatePublished - Dec 1979
Externally publishedYes


  • applanation tonography
  • constant-pressure tonography
  • facility of aqueous outflow
  • glaucoma
  • tonography

ASJC Scopus subject areas

  • Ophthalmology
  • Sensory Systems
  • Cellular and Molecular Neuroscience


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