Tonography, introduced by Grant,1 has been accepted as a useful and practical clinical technique for the measurement of the facility of outflow. More recently, the classical suction cup technique,2,3 has been modified to provide a second clinical method for this measurement. Galin,4 using a suction cup decay method, observed that it was as efficacious clinically as tonography. Furthermore, the results of suction correlated well with those of tonography. Langham,5 using a more complex analysis, also favors the suction cup. In four other comparisons between the two methods with small groups of patients two favor tonography6,7 and two favor suction cup.8,9
The aim of this study is the evaluation and comparison of the two techniques from a practical point of view without consideration of the theoretical aspects. The ability to perform the test as well as the repeatability and diagnostic separability of the results have
FRIEDMAN A, LEVENE RZ. A Comparison Between Tonography and Suction Cup Decay. Arch Ophthalmol. 1966;76(1):16–19. doi:10.1001/archopht.1966.03850010018006
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