ABSTRACT
Three patients with cyclic esotropia are described. In all upshoot in adduction developed in the course of the disease, and in two of the patients a V-pattern was noticed. In two of these cases the strabismus was addresses by surgery on the horizontal muscles only. In the other case both inferior oblique muscles were also weakened. In all patients the V-pattern and upshoot in adduction diminished or completely resolved. Excyclotorsion, caused by loss of fusion may be the explanation for the development of V-pattern and upshoot in adduction in cyclic esotropia. Restoration of fusion by surgery on the horizontal muscles may then be enough to eliminate the vertical incommitance.
