During forty-five years of private practice in ophthalmology I have prescribed prisms incorporated in the lenses used for the correction of errors of refraction. The following record is not the record for all patients examined but only the record for those for whom glasses were prescribed. Each patient's record is kept in a separate space in the record books, so that the results can be easily inspected.
Having been taught that to correct an imbalance of the extrinsic muscles with prisms would aggravate the condition and that the amount of the imbalance would be increased, I began the use of prisms cautiously. Of the first 10,000 patients, 574 were given prisms for the correction of esophoria, 613 for the correction of exophoria and 288 for the correction of hyperphoria. More patients were found with esophoria than with orthophoria, and while they were comfortable with prisms base out, they were also
Dean FW. FREQUENCY OF PHORIAS: Importance of Prism Correction. Arch Ophthalmol. 1939;21(3):511–512. doi:10.1001/archopht.1939.00860030119013
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