The Double Magnetic Induction Method for Measuring Eye Movement - Results in Monkey and Man

Lo J. Bour, Jan A.M. van Gisbergen, Jan Bruijns, Fenno P. Ottes

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104 Citations (Scopus)
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We describe an improved version of the double magnetic induction method for measuring eye movement, proposed by Reulen and Bakker. The idea behind the double magnetic method is to detect eye position indirectly by determining the strength of the induced secondary magnetic field of a short-circuited coil on the subject’s eye caused by a primary magnetic field. A signal related to eye position is obtained from a detection coil, placed in front of the eye, without the need of connecting wires. Instead of the short-circuited Collewijn-coil, we use a polished metal ring on the sclera of the eye. This makes the method more comfortable for the subject and results in a larger signal amplitude. As a further improvement, the signal of the detection coil, consisting of a primary induced component and a relatively weak secondary component, is differentially amplified together with the signal of a compensation coil, consisting of only a primary component, to avoid instrument overload and noise. We have used the method successfully in both man and monkey. Technical specifications of the method, as well as a procedure to correct for its inherent nonlinearity, are described in detail.

Original languageEnglish
Pages (from-to)419-427
Number of pages9
JournalIEEE transactions on biomedical engineering
Issue number5
Publication statusPublished - May 1984
Externally publishedYes


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