THE SO-CALLED IMBERT-FICK LAW

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To the Editor: —Since the beginning of this century, and particularly in recent years, it has been repeatedly stated by different authorities, that tonometry is an exact science based on the so-called Imbert-Fick law. From this law, J. Friedenwald had come to his mathematical calculations and H. Goldmann to his tonometer. The so-called law was not introduced by an expert physicist or mathematician but by an ophthalmologist, who invented a tonometer and looked for a logical foundation to support the rational of the instrument and the method. In science in general, laws are established after a long period of toilsome work. If all natural observations and experimental alteration of nature behave in a certain particular manner, a law can be written concerning these phenomena. Other laws are derived theoretically through logical deductions from mathematical or physical axioms. The so-called Imbert-Fick law states that the pressure (T) inside a sphere filled

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