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This book is the outcome of years of research on the correlation between fixation disparity and oculomotor imbalance by Dr. Kenneth Ogle and his colleagues at the Mayo Clinic. They state that "although the promise of the study was not fully realized, sufficient valuable data was obtained to justify the writing of this monograph." While fixation disparity has been described by earlier researchers, it remained for Dr. Ogle to create interest in this phenomenon which has become closely associated with his name.
The measurement of fixation disparity is described in the book:
It is desirable to use a background target that provides a great many details for the stimulus for fusion of their images. However, for the phenomenon of fixation disparity to be observed with such targets, it is necessary to block out some area within which there are no details for fusion and within which the uniocularly seen test
Chin NB. Oculomotor Imbalance in Binocular Vision and Fixation Disparity. Arch Ophthalmol. 1969;81(3):450–451. doi:10.1001/archopht.1969.00990010452030
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