Accuracy and re-test reliability of mobile eye-tracking in Parkinson's disease and older adults

Medical Engineering & Physics
Samuel StuartBrook Galna

Abstract

Mobile eye-tracking is important for understanding the role of vision during real-world tasks in older adults (OA) and people with Parkinson's disease (PD). However, accuracy and reliability of such devices have not been established in these populations. We used a novel protocol to quantify accuracy and reliability of a mobile eye-tracker in OA and PD. A mobile eye-tracker (Dikablis) measured the saccade amplitudes of 20 OA and 14 PD on two occasions. Participants made saccades between targets placed 5°, 10° and 15° apart. Impact of visual correction (glasses) on saccadic amplitude measurement was also investigated in 10 OA. Saccade amplitude accuracy (median bias) was -1.21° but a wide range of bias (-7.73° to 5.81°) was seen in OA and PD, with large vertical saccades (15°) being least accurate. Reliability assessment showed a median difference between sessions of <1° for both groups, with poor to good relative agreement (Spearman rho: 0.14 to 0.85). Greater accuracy and reliability was observed in people without visual correction. Saccade amplitude can be measured with variable accuracy and reliability using a mobile eye-tracker in OA and PD. Human, technological and study-specific protocol factors may introduce error and are...Continue Reading

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Citations

Feb 1, 2017·Journal of Motor Behavior·Travis H TurnerVanessa K Hinson
Feb 13, 2018·The European Journal of Neuroscience·Samuel StuartLynn Rochester
Jan 30, 2019·Physiological Measurement·Samuel StuartAlan Godfrey
Jul 18, 2017·Medical & Biological Engineering & Computing·S StuartL Alcock
Dec 22, 2020·Frontiers in Sports and Active Living·Samuel StuartLaurie King

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