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Julius Kessler, M.D.
229 E. 79th St. New York 21.

Arch Ophthalmol. 1961;65(1):159.

	Since this article does not have an abstract, we have provided the first 150 words of the full text PDF and any section headings.

To the Editor:

—In a letter published in the ARCHIVES OF OPHTHALMOLOGY (64:159 [July] 1960), Dr. H. H. Markiewitz states in his name and in the name of an investigator, famous at his time, that the so-called Imbert-Fick law is erroneous and that the entire doctrine of ophthalmotonometry—with all its instruments, formulas, and curves—is a metaphysical one without any scientific foundation whatsoever. He bases his opinion on the physical impossibility to indent a sphere walled by an inextensible membrane and filled with an incompressible fluid.

It is certainly correct that a sphere of these specifications cannot be indented by any force of this world. However, the eye is not exactly a sphere and the walls of the eye are not inextensible. The Imbert-Fick-Maklakow equation states only that the portion of the cornea indented or flattened by he application of the tonometer is held in its form and position by opposing . . . [Full Text PDF of this Article]

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