Routine Care Study Evaluating Ocular Torsion

Inclusion Criteria

• •For the subjects without oculomotor disorder
• •no diplopia in different positions of gaze;
• •no oculomotor disorder during the orthoptic examination (horizontal phoria \<8 prism diopter, vertical phoria \<4 prism diopter);
• •corrected visual acuity \> 8/10 on both eyes;
• •binocular vision present in Lang I test (defined by 3 elements seen or appointed);
• •orbital MRI: normal oculomotor muscles (including absence of atrophy of the superior oblique muscle) and lack of intra orbital expansive process;
• •brain MRI: no abnormalities in the ways of oculomotor (especially no abnormalities in posterior fossa).
• •For the patients with SO muscle unilateral paralysis
• •clinical features compatible with unilateral paralysis of the SO muscle
• •muscular body atrophy of the SO on the orbital MRI without other orbital or cerebral abnormality
• •binocular vision in Lang I test