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Clinical Trial Summary

The paralysis of the fourth cranial nerve (paralysis IV), commonly known as the superior oblique muscle (SO) paralysis, represents half of vertical strabismus. The diagnosis of SO paralysis and of its congenital or acquired etiology, are based on a range of clinical findings. The three main clinical diagnostic elements are the hypertropia in paralyzed side which increases in adducted position, the positivity of Bielschowsky head tilt test and the twisting of the eye fundus. These criteria are always considered together and are interdependent. The diagnostic value and the sensitivity of each of these signs is not defined. Brain and orbital Magnetic Resonance Imaging (MRI) allowed a better understanding of the physiopathology of a number of oculomotor disorders.

For this reason, MRI constitute a reference for the SO palsy. The atrophy of the SO muscle is qualitatively determined by the asymmetry of muscle volume on two contiguous coronal MRI.

The diagnostic value of various clinical signs observed in SO paralysis (sensitivity, specificity) remains unknown.


Clinical Trial Description

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Study Design


Related Conditions & MeSH terms


NCT number NCT02894411
Study type Observational
Source Fondation Ophtalmologique Adolphe de Rothschild
Contact Laurence Salomon, MD
Phone +33 148 036 431
Email lsalomon@for.paris
Status Recruiting
Phase N/A
Start date December 21, 2016
Completion date December 2018