Strabismus Measurements Using Automated 3D Video Oculography
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ClinicalTrials.gov Identifier: NCT02228070
Recruitment Status :
First Posted : August 28, 2014
Last Update Posted : October 26, 2017
University of Zurich
Stiftung OPOS zugunsten von Wahrnehmungsbehinderten
Measuring ocular motility and alignment is important for diagnosing different causes of strabismus, following patients recovering from cranial nerve palsies, preparing patients for strabismus surgery and follow-up post surgery. The current clinical gold standards for measuring ocular alignment are the Hess screen and the Harms tangent screen. These tests are accurate, but require patient cooperation, and are not objective because the patient has to indicate the position of the light he sees on the screen. Our objective is to develop an accurate and easy to use goggles system to measure ocular alignment and motility using 3D video oculography.
Validation of video goggles against Hess/Harms screen [ Time Frame: initial visit ]
Measurement of squint angle with 3D video goggles vs. Hess/Harms screen.
Secondary Outcome Measures :
Accuracy of video goggles in comparison to scleral search coils [ Time Frame: initial visit ]
Measurement of squint angle with 3D video goggles vs. scleral search coils.
Other Outcome Measures:
Follow-up squint angle measures post-OP and after recovery from cranial nerve palsy with 3D video goggles and Hess/Harms screen [ Time Frame: initial visit, 3 months after surgery, recovery from cranial nerve palsy after 3 months ]
Change in squint angle with 3D video goggles and Hess/Harms screen.
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Layout table for eligibility information
Ages Eligible for Study:
11 Years and older (Child, Adult, Older Adult)
Sexes Eligible for Study:
Accepts Healthy Volunteers:
Patients 11 years or older
paretic strabismus (oculomotor, abducens and trochlear nerves)
before and after strabismus surgery
Patients unable to sign informed consent
Patients with significantly impaired vision
Patients unable to cooperate with standard strabismus workup (including Hess and Harms tests)
For sub-study: intolerance to scleral search coils