Strabismus Evaluation with a New Videooculograph Device (GazeLab)
Maryo C. Kohen; Faruk H. Orge
University Hospitals of Cleveland / Case Western Reserve University
Cleveland / Ohio
Introduction: Controversy exists regarding the interobserver reliability of alternate prism cover test when measuring strabismus. We hypothesize by using a computerized video device with a strabismic deviation measuring software we could overcome the interobserver differences due to subjectivity. We here tested if the results of a new (ocular movement digitizer) named GazeLab displaying and measuring the horizontal and vertical ocular motility disorders compered to clinical measurements from one examiner.
Methods: As a retrospective study we compared the clinical evaluations of horizontal strabismus of 32 patients (15 men and 17 women) with mean age of 25 from one ophthalmologist to the recordings and interpretation of the videooculograph device. Because of lack of cooperation we were not able to include pediatric patients who usually have concomitant strabismus.
Results: Using Microsoft Excel Correlation data analysis the results of the clinical evaluations and videooculograph results were correlated. (0.85)
Discussion: Objective assessment of strabismus is utmost important since the only reliable way to assess it now is clinical evaluation which is subjective. Our results are consistent with our hypothesis results of the device with clinical evaluation shows strong correlation.
Conclusion: Objective measurement of strabismus is an ever evolving area of research with new machines and algorithms being developed. We believe devices like GazeLab will be an indispensable tool for strabismic evaluation in the future.
References: Shen E, Porco T, Rutar T. Errors in strabismus surgery. JAMA Ophthalmol. 2013 Jan;131(1):75-9
De Jongh E, Leach C, Tjon-Fo-Sang MJ, Bjerre A. Inter-examiner variability and agreement of the alternate prism cover test (APCT) measurements of strabismus performed by 4 examiners. Strabismus. 2014 Dec;22(4):158-66.