About the Authors

Lisa A. Donaldson

Roles Conceptualization, Data curation, Formal analysis, Investigation, Methodology, Project administration, Resources, Writing – original draft, Writing – review & editing

l.donaldson@seeability.org

Affiliation SeeAbility, Epsom, Surrey, United Kingdom

Marek Karas

Roles Conceptualization, Data curation, Formal analysis, Investigation, Methodology, Project administration, Writing – review & editing

Affiliation SeeAbility, Epsom, Surrey, United Kingdom

Donna O’Brien

Roles Formal analysis, Investigation, Project administration, Writing – review & editing

Affiliation SeeAbility, Epsom, Surrey, United Kingdom

J. Margaret Woodhouse

Roles Conceptualization, Data curation, Formal analysis, Investigation, Methodology, Project administration, Software, Supervision, Validation, Writing – review & editing

Affiliation School of Optometry & Vision Sciences, Cardiff University, Cardiff, United Kingdom

Competing Interests

Lisa A Donaldson, Marek Karas and Donna O’Brien are employed by SeeAbility. Dr J Margaret Woodhouse has a commercial interest in the Cardiff Acuity Cards. This does not alter our adherence to PLOSONE policies on sharing data and materials.