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Some years ago, when I became especially interested in the subject of the dynamics of the extrinsic ocular muscles, I read and reread the chapters on this subject. As the subject to me at that time was abstruse and puzzling I tested repeatedly the strength of the ocular muscles in my own case, and as I could only get a fractional amount of prism dynamics compared with that given in the books I concluded that mine was an exceptional case, that the strength of my extrinsic ocular muscles was greatly below the normal; but when I began to test some of my patients and found that their abduction as a rule only amounted to 6 or 8 degrees, while the adduction rarely exceeded 20 or 30 degrees, which was much less than was stated in the text-books, I began to think that there was some mistake. Either I had not
TIFFANY FB. DYNAMICS OF THE EXTRINSIC OCULAR MUSCLES. JAMA. 1898;XXXI(15):846–848. doi:10.1001/jama.1898.92450150032001o
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