[Superior oblique muscle paralysis and ocular torsion. What is the effect of measuring method on the results?].
BACKGROUND
The rotation of the eye-ball around Fick's Y-axis is called ocular torsion. A precise measurement of the torsional deviation can be clinically as critical in the diagnosis of some complex strabological disorders as in the assessment of some systemic diseases.


METHODS
We measured the ocular torsion under binocular conditions by five measurement devices on 50 patients with superior oblique palsy. The comparison of the devices was performed using rank tests (Friedman, Wilcoxon signed rank).


RESULTS
The 5 methods of measurement do not produce equivalent results. These findings confirm on a population of paretic patients similar published results obtained with healthy subjects.


CONCLUSIONS
The simple Maddox rod and the synoptophore are among the most widely used methods to measure cyclotropia; this study reveals that these devices are the least reliable. Harm's tangent scale gives the most reliable results, in all directions of gaze; however, in inferior adduction, the synoptometer also yields a satisfactory measure of ocular torsion. In primary position, the double Maddox glass appears to be the most suitable instrument.
Capdepon
E
E
Unité de Strabologie-Hôpital Ophtalmique Universitaire, Lausanne.
Klainguti
G
G
Strickler
J
J
van Melle
G
G
D000293:Adolescent; D000328:Adult; D000368:Aged; D002648:Child; D003627:Data Interpretation, Statistical; D005260:Female; D005403:Fixation, Ocular / Q000502:physiology; D006801:Humans; D008297:Male; D008875:Middle Aged; D009886:Ophthalmoplegia / Q000175:diagnosis* / Q000209:etiology / Q000601:surgery; D011183:Postoperative Complications / Q000175:diagnosis; D011237:Predictive Value of Tests; D015203:Reproducibility of Results; D013285:Strabismus / Q000175:diagnosis* / Q000209:etiology / Q000601:surgery; D014787:Vision Tests / Q000295:instrumentation* / Q000706:statistics & numerical data; D015348:Vision, Binocular / Q000502:physiology
Paralysie du grand oblique et torsion oculaire. Quelle est l'influence exercée sur les résultats par les méthodes de mesure?