About the Authors

David Whitaker

D.J.Whitaker@bradford.ac.uk

Affiliation Department of Optometry, University of Bradford, Bradford, United Kingdom

Dennis M. Levi

Affiliation School of Optometry and Helen Wills Neuroscience Institute, University of California, Berkeley, California, United States of America

Graeme J. Kennedy

Affiliation Department of Optometry, University of Bradford, Bradford, United Kingdom

Competing Interests

The authors have declared that no competing interests exist.

Author Contributions

Conceived and designed the experiments: DL DW GK. Performed the experiments: DL DW GK. Analyzed the data: DL DW GK. Wrote the paper: DL DW GK.