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Strabismus.

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Accommodation, Ocular↗

Strabismus.

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Central America↗

Strabismus.

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Accommodation, Ocular↗

Strabismus.

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Abducens Nerve↗

An improved method of fitting resultant prism in treatment of two-axis strabismus.

A new chart determines resultant prism power and angle when correction of combined horizontal and vertical deviation with a single prism, set at an angle intermediate between horizontal and vertical, is desired. The chart is based on a derivation so weighted as never to permit a vertical error greater than one tenth as large as the associated horizontal error, with use of commercially available sizes of plastic Fresnel-type prisms. This weighting takes into account differences in horizontal and vertical fusional reserves. A compass rose facilitates proper alignment of the prisms.

Humans↗

Cyclodeviation in acquired vertical strabismus.

The prevalence and pattern of cyclodeviation can differentiate among superior oblique palsy, dysthyroid ophthalmopathy, myasthenia gravis, and skew deviation. Excyclodeviation was detected in 30 of 33 patients with superior oblique palsy, eight of 15 patients with dysthyroid ophthalmopathy, three of six patients with nondysthyroid restrictive ophthalmopathy, and one of 13 patients with myasthenia. No cyclodeviation was found in cases of skew. Incyclodeviation was found in two patients with dysthyroid ophthalmopathy, two with nondysthyroid restrictive ophthalmopathy, and three with myasthenia. The amount of cyclodeviation did not vary between head-tilt positions, but did vary between primary and eccentric gaze positions, usually in the same direction as the amount of hyperdeviation. The patient's awareness of the presence of cyclodeviation varied with the degree of cyclodeviation, being 100% (4/4) for 15 degrees, 86% (12/14) for 10 degrees, and only 55% (11/21) for 5 degrees.

Eye Movements↗

Incomitant vertical strabismus. Treatment with posterior fixation of the inferior rectus muscle.

Three patients with evidence of inferior rectus muscle paresis were surgically treated for diplopia in downgaze following blowout fracture of the orbit or operative trauma. In each case, surgery involved the placement of two posterior fixation sutures 13 or 14 mm behind the physiologic insertion of the inferior rectus muscle in the contralateral eye. In one case, posterior fixation was combined with a small inferior rectus muscle recession. All three patients experienced relief of their diplopia and improvement in their binocular field of vision. There were no untoward sequelae and no surgically induced changes in primary position alignment.

Adult↗

A caliper-hook for strabismus surgery.

An instrument to assist in resection surgery consists of a telescoping hook within a second hook that can be spread a calibrated distance. Its primary purpose is to maintain a constant tension and an accurate measure of tendon length during suture passage. Additionally, the grooved distal hook supports the needle and protects the globe from needle trauma.

Equipment Design↗