[Motor disturbances in squint - pathogenesis and treatment (author's transl)].

Motor deviation in strabismus must be considered in the context of the different elements which determine it, that is, taking account of the nature of the deviation. Modifications in the muscle may on very rare occasions be due to a paretic origin, but they can also be of innervational origin or stem from muscular modifications secondary to the innervational deviation. To decide on operative procedure, it is absolutely essential to determine the aetiology of the deviation, for normal static and dynamic motility can only be achieved by an aetiological therapy. Since muscular disorders may be of various kinds, and given that in many cases, the deviation can be cured by functional treatment alone, the author does not feel that the precise measurement of the deviation by an instrument such as the synoptometer is indispensable, the best assurance of a post-operative oculomotor balance being the suppression of abnormal accommodation and the normalisation of the retinal correspondence before the surgical intervention. This affirmation is supported by the clinical and experimental data presented in this paper.