Excerpt from Papers to Be Presented Before the Section on Ophthalmology of the American Medical Association: Boston, June 5-8, 1906
Whereas, No matter in what way the measurements have been made, when the result 'is recorded in the strength of the prism, which can be overcome, some practitioners count that as if a prism were held before each eye, and others as if one prism of twice the strength were held before one eye only; and, whereas, These differences in methods of using prisms and of recording the results of tests, have given rise to different estimates of the strength of the extraocular muscles, with cor responding confusion of our ideas on the subject; and.
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