I am in accord with the present teachings that phorias may be caused by what is variously termed imbalance of ocular muscles, insufficiency of ocular muscles, lack of enervation and weak sense of fusion. I shall not review these factors but shall call attention to certain anatomic conditions of the eye which are responsible for a phoria of a different type than those usually observed and which require a different kind of treatment.
In a paper on prisms read at a meeting of the American Academy of Ophthalmology and Otolaryngology at Philadelphia in 1921, I presented a table which showed that there were phorias which did not vary in amount over a period of years.1 Now, fourteen years later, I have again tabulated the results in cases in which I have prescribed prisms. This table presents data on a larger number of cases of exophoria and hyperphoria,
DEAN FW. ANATOMIC PHORIAS. Arch Ophthalmol. 1936;15(4):692–695. doi:10.1001/archopht.1936.00840160116008
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