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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
Kessler J. THE IMBERT-FICK-MAKLAKOW EQUATION. Arch Ophthalmol. 1961;65(1):159. doi:10.1001/archopht.1961.01840020161023
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