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

Stuart, Susan, Alcock, Lisa, Godfrey, Alan, Lord, Stephen, Rochester, Lynn and Galna, Brook (2016) Accuracy and re-test reliability of mobile eye-tracking in Parkinson's disease and older adults. Medical Engineering & Physics, 38 (3). pp. 308-315. ISSN 1350-4533

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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 discussed along with methodological recommendations.

Item Type: Article
Uncontrolled Keywords: Parkinson's disease, Mobile eye-tracking, Accuracy, Reliability, Saccades, Walking
Subjects: B900 Others in Subjects allied to Medicine
Department: Faculties > Engineering and Environment > Computer and Information Sciences
Depositing User: Becky Skoyles
Date Deposited: 20 Apr 2018 14:46
Last Modified: 10 Oct 2019 23:31

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