Development of the Various Methods of Esthesiometry
M. von Frey presented in 1894 in his publication “Contribution to the physiology of pain” the first “esthesiometer.” “A hair or a piece of it which should be as little curved as possible, is attached to the end of a light wood rod of about 8 cm length. The hair lies vertical to the axis of the rod so that it will on one side protrude for 20–30 mm, under certain circumstances even more. Such a rod presents with appropriate application a stimulus of definite and permanent value. If the hair is now placed vertically on the skin surface, a pressure will be exerted which cannot exceed a certain limit.” (Fig. 5.)
KeywordsCorneal Surface Test Body Corneal Dystrophy Direct Electric Current Lever System
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