Duane retraction syndrome

Duane retraction syndrome (DRS), also known as Duane anomaly or Stilling-Türk-Duane syndrome, is a congenital eye movement disorder characterized by limited ability to move one or both eyes outward (abduction), inward (adduction), or both, accompanied by retraction of the eyeball into the orbit and narrowing of the palpebral fissure (eyelid opening) on attempted adduction. The condition results from abnormal development of the sixth cranial nerve (abducens nerve) and aberrant innervation of the lateral rectus muscle by branches of the third cranial nerve (oculomotor nerve) during embryonic development. DRS is classified into three types: Type I (most common, ~70-80% of cases) involves limited or absent abduction with relatively normal adduction; Type II involves limited or absent adduction with relatively normal abduction; and Type III involves limitation of both abduction and adduction. DRS primarily affects the ocular motor system and is typically unilateral, with the left eye more commonly affected than the right. It occurs more frequently in females than males. Many patients adopt a compensatory head turn to maintain binocular vision and avoid diplopia (double vision). Some individuals may also exhibit upshoot or downshoot of the affected eye during adduction. While most cases are isolated (sporadic), familial forms exist, and DRS can occasionally occur as part of broader syndromes, such as Okihiro syndrome (caused by SALL4 mutations) or in association with other congenital anomalies including deafness, skeletal abnormalities, or Goldenhar syndrome. There is no cure for Duane retraction syndrome, and treatment is directed at managing symptoms and improving function. Many patients with mild forms require no intervention. Surgical treatment, typically involving recession or weakening of the medial rectus muscle, may be considered when there is a significant head turn, strabismus in primary gaze, marked globe retraction, or cosmetically unacceptable upshoot/downshoot. Surgery aims to improve alignment in primary position and reduce abnormal head posture but cannot restore normal eye movement. Prism glasses may occasionally be used for mild misalignment. Early ophthalmologic evaluation is important to monitor for amblyopia, particularly in young children.

Common questions about Duane retraction syndrome