Amount of surgery in congenital nystagmus

By analyzing the clinical data on the amount of surgery on the extraocular muscles and resulting angular shift of the null zone in 24 patients with congenital nystagmus, a linear dependence was found to exist between these two variables. Hence, the amount of surgery can be confidently established in advance of treatment in order to obtain the shift of the null zone. Many cases of partial surgical successes are discussed and explained a posteriori by a lack of a proper amount of surgical rotation.