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—In response to Dr Giangiacomo's question, all PA study patients1 had their ocular deviations measured at least twice on separate occasions before the first randomization, with agreement on both simultaneous and alternate prism and cover tests to within 5 prism diopters to demonstrate stability of their deviation. Certainly, those in the PA groups (PAR/PS, PAR/ES, and PANR/ES [PA nonresponders who underwent surgery for their deviation at entry into the study]) had more measurements in the course of prism adjustment than patients in the control group (non-PA/ES). There was no difference in the number of measurements between the PAR/PS and PAR/ES groups. It is theoretically possible that the superior results in the PAR/PS group were due only to additional measurement, although this seems unlikely. In the PAR/PS group, the target angle for surgery was always greater than or equal to the entry angle of deviation, with the increase
Connett JE, Scott WE. Prism Adaptation Test (PAT) in the Surgical Management of Acquired Esotropia-Reply. Arch Ophthalmol. 1991;109(6):766. doi:10.1001/archopht.1991.01080060019004