Basic principles for strabismus reinterventions.

Fibro-elastic and mechanical factors are more important in reinterventions than in traditional strabismus surgery. It is imperative to detect them preoperatively and intraoperatively. For this purpose, the patient's personal history and complaints are analysed and some specific examination techniques are discussed such as the intraoperative eye position, the forced duction test, the muscle elasticity test and the spring back test.