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. 2020 Apr 7;94(14):e1539–e1547. doi: 10.1212/WNL.0000000000009214

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Copyright © 2020 The Author(s). Published by Wolters Kluwer Health, Inc. on behalf of the American Academy of Neurology.

This is an open access article distributed under the terms of the Creative Commons Attribution-NonCommercial-NoDerivatives License 4.0 (CC BY-NC-ND), which permits downloading and sharing the work provided it is properly cited. The work cannot be changed in any way or used commercially without permission from the journal.

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Reported interference with daily activities due to ophthalmologic symptoms in the Parkinson disease (PD) group (n = 848) compared with controls (n = 250). Each pair of bars represents patients with PD compared with healthy controls. ***p < 0.001.