[Indications for interventions on oblique muscles of the eye (author's transl)].

Interventions in cases of vertical squint are done in most cases on the oblique muscles. Vertical squint occurs most frequently as a vertical component in horizontal deviations in children with early concomitant strabismus. Without horizontal deviation but with binocular vision, it is rare in symmetric, but rather frequent in asymmetric forms: the sursoadductory form occurs as "congenital trochlear paresis", the deorsoadductory form as "Brown's syndrome". Acquired paresis can cause oblique vertical forms of squint. Operative indications to be observed: 1. Size and nature of vertical deviation, changes of field of gaze. In horizontal and vertical changes of gaze, different patterns of incomitance have to be observed. 2. Horizontal components of squint: Their correction does not abolish VD (vertical deviation), this should be performed by intervention on the obliqui. In A- and V- incomitance with dysfunction of the vertical motors, these have to be operated on. 3. Method of fixation: If forms of upper squint are asymmetric, both eyes should be operated on.