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[Comparison of 2 techniques for evaluating static monocular cyclotorsion with central visual field and scanning laser ophthalmoscope].

OBJECTIVE
To compare the angles of cyclotorsion measured by central campimetry and scanning laser ophthalmoscopy.


METHODS
Both methods were applied to each eye of 44 healthy volunteers, aged between 22 and 55 years. The line passing through the fovea and the center of the papilla was drawn on images from the scanning laser ophthalmoscope (SLO); the line passing through the fixing point and the center of the blind spot was drawn on the charts of the central visual field (VF). Torsion was estimated by the angle between these lines and the horizontal.


RESULTS
With the VF method, the excyclotorsion was 5.6+/-2.9 degrees on the right eye and 7.2+/-2.9 degrees on the left eye. With the SLO method, these values were 4.7+/-2.6 degrees and 6.8+/-2.5 degrees , respectively. The measures obtained with both methods correlated significantly, for the right eye and the left eye, as well as for the difference between them.


CONCLUSION
Data were in good agreement with the literature. Though slightly greater, values obtained with the scanning laser ophthalmoscope were coherent with campimetric measures. The origin of the greater excyclotorsion of the left eye remains an open issue. This phenomenon must be kept in mind when looking for a pathological between-eye difference.