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The deviometer, right and left (as shown in the accompanying illustration), is made of dental rubber with polished surfaces. The inner surface conforms to the shape of the face below the margin of the lower eyelid and the side of the nose. The outer surface is flat, having on it a milimeter scale bar (A) with two sliding dials (B). The upper thumbscrew (C) adjusts the dial forward or backward for prominent
Registering deviometer, right and left. A indicates the millimeter scale bar, B, the sliding dials ; C, the upper thumbscrew, and D, the lower thumbscrew. or for deep-set eyes. The dials are moved laterally and fixed by the lower thumbscrew (D).
Several methods have been employed to measure the angle of squint. Linear strabismometry, at one time the popular method, is almost obsolete. Later, this plan was followed by estimating the position of the corneal reflex. The newer methods
Smukler ME. REGISTERING DEVIOMETER: An Instrument to Measure the Degree of Squint. Arch Ophthalmol. 1939;22(5):881–882. doi:https://doi.org/10.1001/archopht.1939.00860110171011
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