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Investigative Ophthalmology & Visual Science, Vol 27, 1776-1780, Copyright © 1986 by Association for Research in Vision and Ophthalmology

ARTICLES AND REPORTS

Comparative aqueous outflow facility measurements by pneumatonography and Schiotz tonography

JG Feghali, DT Azar and PL Kaufman

Tonography was performed on 36 eyes of 15 normal and 3 primary open angle glaucoma patients using pneumatonography and classical Schiotz tonography. The average values of the coefficient of outflow facility (C) for the whole sample were virtually identical with both methods. However, both intersubject and interobserver variability were significantly higher with penumatonography. Although both methods provide comparable aggregate estimates of aqueous outflow facility, we think that Schiotz tonography is more reliable than pneumatonography because of the greater mechanical stability of the Schiotz instrument on the eye. On the other hand, pneumatonography offers the advantage of a shorter test period (2 min instead of 4).




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Copyright © 1986 by the Association for Research in Vision and Ophthalmology