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Oren Yehezkel, Abraham Spierer, Ran Yam, Dan Oz, Michael Belkin, Tamara Wygnanski – Jaffe; An objective rapid system based on eye tracking for eye deviation measurement in children and adults. Invest. Ophthalmol. Vis. Sci. 2018;59(9):1024.
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© ARVO (1962-2015); The Authors (2016-present)
We have recently demonstrated the high accuracy and repeatability of a newly developed eye-tracking-based strabismus measurement system (Eyeswift), comprising a 3D display and glasses as tested on adults. Here we present newly developed active full-occlusion glasses, designed to automatically perform both types of cover test, thus enabling rapid, objective ocular deviation measurements in both children and adults. Moreover, this system enables continuous simultaneous measurements in both occluded and non-occluded eyes, allowing complete and exact deviation characterization.
Four children with strabismus were tested on the automated system and the traditional UCPT (average age 7.9±2.4 years, mean±std). During the test, a moving target is presented to the non-occluded eye until a fixation is achieved. Next, the occlusion is switched to the other eye. This way, instead of adjusting the line-of-sight of the deviating eye by using prisms while gazing at a single target, an eye tracker is used to detect cessation of eye movements when both eyes fixate at their corresponding targets. No eye tracker calibration is required to perform the test. The deviation direction and magnitude are automatically calculated from the distance between the two final target positions and the viewing distance. Tests were conducted under normal room lighting, at 60 cm.
The results showed a deviation of 10.98±2.7 (mean±se) for the eye tracking method, which is highly correlated to the UCPT measurement of 11.6±2.5 (mean±se; R=0.93).
These preliminary results indicate the potential clinical utility of a novel strabismus angle measurement method using an automatic, objective, rapid and accurate system based on eye tracking.
This is an abstract that was submitted for the 2018 ARVO Annual Meeting, held in Honolulu, Hawaii, April 29 - May 3, 2018.
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