Relationship between fixation disparity curves and symptoms in monofixators

Patients with small angle strabismus usually are asymptomatic. Occasionally, however, binocular asthenopic symptoms are reported. Two monofixators, one symptomatic and the other asymptomatic, with similar profiles on strabismic evaluation had forced vergence Fixation Disparity Curves (FDC) measured. Slope of the FDC may help to discriminate between the symptomatic and asymptomatic patient.