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.

Inclusion Criteria:

• Patients 11 years or older
• congenital strabismus
• acquired strabismus
• paretic strabismus (oculomotor, abducens and trochlear nerves)
• before and after strabismus surgery
• normal controls

Exclusion Criteria:

• 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