Funding for this research was provided by:
National Eye Institute (R01EY18966)
National Institute on Aging (P30AG22838)
EyeSight Foundation of Alabama
Research to Prevent Blindness (NA)
Received: 6 September 2017
Accepted: 18 January 2018
First Online: 7 February 2018
Ethics approval and consent to participate
: This study was approved by the Institutional Review Board of the University of Alabama at Birmingham (protocol number F131223001) and by the Institutional Review Board of Virginia Tech Transportation Institute (protocol number 14–636). Written informed consent is obtained from participants after the nature and purpose of the study are described.
: Not applicable.
: The authors declare that they have no competing interests.
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