• A curved ruler for measurement along the surface of the globe has been designed to measure the arc instead of the cord measurement. The ruler is especially helpful when one is doing large recessions and posterior fixation of the recti muscles (Faden operation).
Scott WE, Martin-Casals A, Braverman DE. Curved Ruler for Measurement Along the Surface of the Globe. Arch Ophthalmol. 1978;96(6):1084. doi:10.1001/archopht.1978.03910050604025