Can Ocular Torsion be Measured Using the Slitlamp Biomicroscope?

Kothari, Mihir T.; Venkatesan, G.; Shah, Jugal P.; Kothari, Kulin; Nirmalan, Praveen K.
March 2005
Indian Journal of Ophthalmology;Mar2005, Vol. 53 Issue 1, p43
Academic Journal
Purpose: To evaluate and compare a stereo-biomicroscopic technique of ocular torsion measurement with fundus photographic technique. Methods: This prospective masked observational study included 72 eyes of 36 consecutive subjects with normal ocular motility. The disc-foveal angle was measured by two masked investigators using a slitlamp stereo-biomicroscopic and fundus photographic technique. Results: The mean age was 13.7 years (6 - 44 years), and 15 (41.6%) were males. The average torsion using the slitlamp technique was 5.5 ± 3.3° and 6.1 ± 4.3° with fundus photographic technique. Clinical agreement between the two techniques for 5° and 6° torsion was 81% and 90% respectively. The average difference between the two techniques was 3.0 ± 2.6°. The mean inter-ocular difference was 3.3 ± 2.7 ° (SD, 2.77) and 5.5 ± 4.6 ° using the slitlamp and fundus photographic technique respectively. The Pearson correlation coefficient (r²) was 0.5 Conclusion: The fundus photographic technique remains the gold standard test for the measurement of ocular torsion. The slitlamp biomicroscopic method can be useful where a fundus camera is unavailable. Further studies are required to test the repeatability of these tests.


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