TY - JOUR
T1 - Validity of the Imbert-Fick law for constant-pressure tonography
AU - Viernstein, Lawrence J.
AU - Pollack, Irvin P.
N1 - Funding Information:
This researchw as supported by National Eye Institute Grant EY and Alexander P. Hirsch Fund, Fight for Sight, Inc., N.Y.C.
Copyright:
Copyright 2014 Elsevier B.V., All rights reserved.
PY - 1979/12
Y1 - 1979/12
N2 - In the clinical evaluation of constant-pressure tonography, charts are required by the medical technician for determining the value of aqueous outflow facility from the force readings obtained from the tonography instrument. The accuracy of the tables depends upon the validity of Imbert-Fick law in this application. As a result of earlier experiments on excised human corneas, there has been some question as to whether use of this law leads to large errors when applied to corneal applanation, and it has been suggested that use of an empirical relation would be better. In this study the accuracy of the Imbert-Fick law was tested with the use of rabbit and human cornea, and in the intact and the enucleated rabbit eye. Our results also do not conform exactly to the Imbert-Fick law, but the errors are not excessive for the practical application of the law to constant-pressure tonography. In fact, its use leads to errors of lesser magnitude than errors from other sources in the constant-pressure measurement of aqueous outflow facility.
AB - In the clinical evaluation of constant-pressure tonography, charts are required by the medical technician for determining the value of aqueous outflow facility from the force readings obtained from the tonography instrument. The accuracy of the tables depends upon the validity of Imbert-Fick law in this application. As a result of earlier experiments on excised human corneas, there has been some question as to whether use of this law leads to large errors when applied to corneal applanation, and it has been suggested that use of an empirical relation would be better. In this study the accuracy of the Imbert-Fick law was tested with the use of rabbit and human cornea, and in the intact and the enucleated rabbit eye. Our results also do not conform exactly to the Imbert-Fick law, but the errors are not excessive for the practical application of the law to constant-pressure tonography. In fact, its use leads to errors of lesser magnitude than errors from other sources in the constant-pressure measurement of aqueous outflow facility.
KW - applanation tonography
KW - constant-pressure tonography
KW - facility of aqueous outflow
KW - glaucoma
KW - tonography
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U2 - 10.1016/0014-4835(79)90013-7
DO - 10.1016/0014-4835(79)90013-7
M3 - Article
C2 - 544277
AN - SCOPUS:0018734038
SN - 0014-4835
VL - 29
SP - 587
EP - 594
JO - Experimental Eye Research
JF - Experimental Eye Research
IS - 6
ER -