Mr. President and Gentlemen:—My excuse for the presentation of a paper on the fourth degree prism in the correction of hyperphoria, is based on the belief that ophthalmologists as a body are not analyzing these cases with a view to correcting so small an amount of error.
I shall waste none of your valuable time by reference to the differences of opinion which prevail regarding heterophoria in general, but will proceed directly to give the results of my experience with the correction of hyperphoria of low degrees.
It has doubtless been the lot of every member of this Section to meet cases of asthenopia so nearly approximating emmetropia, and having so little apparent disturbance of muscular equilibrium, that it seemed impossible to account for the symptoms, and they have continued to suffer uncorrected.
These cases were made much less frequent by the valuable contribution of Dr. Chisholm on "The Value
PRINCE AE. THE FOURTH DEGREE PRISM IN THE CORRECTION OF HYPERPHORIA. Read in the Section of Ophthalmology at the Forty-third Annual Meeting of the American Medical Association, held at Detroit. Mich., June 1892. JAMA. 1892;XIX(9):253–257. doi:10.1001/jama.1892.02420090015002f
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