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To the Editor.
—Merton C. Flom, PhD, and Kenton E. Kerr, MOptom, have presented a paper "Determination of Retinal Correspondence" (Arch Ophthal77:200-213 [Feb] 1967) in which they challenge the view that the presence or absence of differences in the mode of localization in various tests for retinal correspondence (ARC) offers an indication of how thoroughly the ARC is established in a patient. The authors base their conclusion on elaborate statistical analyses which for all that remain unconvincing for a number of reasons.First, the group of subjects on whom they report is very heterogeneous. Included are 47 constant squinters (both esotropes and exotropes, the proportion is not given), 22 "occasional" (intermittent?) squinters, and 24 nonsquinters (presumably patients with heterophoria).Second, this inhomogeneity is the more disturbing since the groups are clinically ill defined. Patients who have to begin with a heterophoria have, by definition, normal correspondence. They