This study investigated the intraobserver reliability and repeatability of the Harms tangent screen (HTS) in patients with diplopia due to concomitant, paralytic or restrictive strabismus in a prospective study of 58 patients (46.6% female). Mean age was 54 ±17.12 years, mean spherical equivalent of -1.29 ±3.81D, 22 esotropia, 7 exotropia, 7 restrictive strabismus, 2 third nerve palsy (NP), 13 fourth NP and 7 sixth NP. Right fixation was in 30 patients and left in 28. In primary gaze, limits of agreement were -3.1 to 2.9 degrees for horizontal angle, -2 to 2.2 degrees for vertical angle and -3.6 to 3.1 degrees for torsional angle. There were no significant differences of different gaze positions and strabismus angles. Intraclass correlations were ≥0.93 indicating excellent reliability. The authors conclude HTS is a reliable method for measurement of ocular deviation in different gaze positions.
Reliability and repeatability of Harms tangent screen measurements
Reviewed by Fiona Rowe
Intra-observer reliability of the Harms tangent screen test.
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Fiona Rowe (Prof)
Institute of Population Health, University of Liverpool, UK.
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