The instrument here described has been designed to measure deviations of the eyes in cases of squint and heterophoria. It will measure vertical deviations in the six cardinal directions, as well as horizontal deviations for distance and near vision. Its accuracy, especially in objective tests, is greater than that of any other method of which we know.
The principle employed is the movement of two light sources to describe two spheres the centers of which are substantially coincident with the centers of rotation of the eyeballs (fig. 1). The two light sources are independently movable and are shielded in such a manner that a narrow beam is visible only to the eye about the center of which it travels. The light is visible to the observer as a reflex on the cornea of the eye fixing it. Each light is mounted on a movable arm which permits it to be
QUEREAU JV, PUTNAM OA. QUEREAU-PUTNAM TROPOPHOROMETER. Arch Ophthalmol. 1945;33(1):28–31. doi:10.1001/archopht.1945.00890130042006
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