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The importance of recognizing and correcting with absolute accuracy, any existing error of refraction, has long since become an axiom, a truth too evident to require demonstration. In the past decade, mainly as a result of careful clinical study, errors of muscular balance have been attracting the attention of the ophthalmic surgeon; but in this field there still exist wide differences of opinion both as to the importance of muscular defects and the necessity for their treatment. One may find almost anything desired by searching the literature of this subject. If he be naturally conservative he may read of that wonderful and unfailing "cure-all" for muscular imbalance, prismatic exercise. The method of cure is both simple in its application and positively harmless. It is even monotonous in the uniformity of its good results. On the other hand, should the ophthalmologist be surgically inclined; should his desire be to refute the
CARPENTER JT. A CLINICAL STUDY OF HYPERPHORIA.. JAMA. 1898;XXX(4):198-201. doi:10.1001/jama.1898.72440560026001j