• A new chart determines resultant prism power and angle when correction of combined horizontal and vertical deviation with a single prism, set at an angle intermediate between horizontal and vertical, is desired. The chart is based on a derivation so weighted as never to permit a vertical error greater than one tenth as large as the associated horizontal error, with use of commercially available sizes of plastic Fresnel-type prisms. This weighting takes into account differences in horizontal and vertical fusional reserves. A compass rose facilitates proper alignment of the prisms.
(Arch Ophthalmol 95:1255-1257, 1977)
Reinecke RD, Simons K, Moss A, Morton G. An Improved Method of Fitting Resultant Prism in Treatment of Two-Axis Strabismus. Arch Ophthalmol. 1977;95(7):1255-1257. doi:10.1001/archopht.1977.04450070153015