Surgical Effect of Type I Nystagmus Blockage Syndrome

ABSTRACT

Six patients of nystagmus blockage syndrome (type 1) underwent both medial rectus recession and posterior fixation suture. Associated amblyopia wsa treated with occlusion or atropinization before and after surgery. During follow-up period for 12 weeks (4-36 weeks), four patients revealed orthophoria and one was esotropi a less than 5 delta and the other was 4-5 delta exotropia. The tropic status was stable, and in two patients who had manifest latent nystagmus, the amplitude of nystagmus was markedly decreased. Head turn was present in all patients before surgery. After surgery head turn was disappeared in five patients but still remained in one although their tropic status changed to orthophoria and the visual acuities of both eyes were equal.