Strabismus Fixus Convergens

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<p>　Strabismus fixus convergens is characterized by restriction in both abduction and supraduction;the affected eye remains fixed in an esotropic and hypotropic position. Strabismus fixus with high myopia is specifically referred to as intractable strabismus.</p><p>　The retro-equatorial portion of the enlarged globe dislocates superotemporally from the muscle cone through the space between the superior and lateral rectus muscles. Magnetic resonance imaging（coronal view）reveals nasal displacement of the superior rectus, inferior displacement of the lateral rectus and dislocation of the globe out of the muscle cone. The Yokoyama procedure unites the superior and lateral rectus muscle bellies using a suture（15 mm）posterior to the muscle insertions. Restoration of the dislocated globe into the muscle cone improves ocular deviation and eliminates the mechanical restriction in ocular motility.</p>

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