The question "When and how should one operate for convergent strabismus?" was asked at a recent meeting, and I made the statement at the time that a question involving so many considerations could not be answered in the time allowed. One hears much discussion on the subject of whether some form of advancement or some form of recession is the better procedure for the correction of convergent strabismus. This discussion seems futile, for when an external rectus needs help, no form of tenotomy on an internal rectus will be of much aid, and when an internal rectus is too powerful, no form of advancement will give the desired results. If one confines the discussion to the means of aiding the external rectus one may consider the advantage and disadvantage of an advancement or any of its modifications, of a resection or its modifications, of a tucking and its modifications