Abstract
<h3>PROFESSOR OF DISEASES OF THE EYE IN THE PHILADELPHIA POLYCLINIC; SURGEON TO WILLS EYE HOSPITAL.</h3> We are all familiar with the Maddox rod or cylinder test. Doubtless many have used it in connection with some form of rotary prism, and Dr. Prince of Springfield, Ill., has combined the two in a convenient phorometer. But both the cylinder test and the rotary variable prism are capable of development into forms of greater practical value. The cylinder test belongs to that class of tests for heterophoria in which binocular fusion is prevented by dissimilarity of the images; the one image being distorted by a very strong cylinder, the Maddox glass rod, placed before one eye. The line of light seen by the eye before which the rod is held, varies in length with the diameter of the rod employed, and the distance at which it is held before the nodal point of
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