[Cüppers' string operation (author's transl)].

Cüppers' thread operation opens a new chapter in Oculo-motor surgery. This operation aims at reducing the rotational force of the recti muscles innervational impulsion without changing the balance in primary position. This result is obtained by suturing the muscle belly and sclera at least 13 mm behind the original scleral insertion. The indications for this operation are the following: 1. Oculo-motors Paralysis, in acoordance to the Cüpper's principle: "paresis versus paresis" reducing the rotational force of the innervational impulsion of a muscle induces an increasing of innervational impulsion in the yoke muscle. 2. Surgery in excentric fixation: creating a pseudo-paralysis induces a change of fixation in the opposite direction. 3. Nystagmus surgery: the thread allows a reduction of the innervational impulsion in the muscles which create the blockage; the abnormal head posture is thus reduced. 4. Surgery in variable non accommodative squint: the static component of the deviation is treated by classical surgery, the dynamic component by thread operation.