About the Authors
- Robert Lindfield
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* E-mail: Robert.lindfield@lshtm.ac.uk
Affiliation International Centre for Eye Health, London School of Hygiene and Tropical Medicine (LSHTM), London, United Kingdom
- Ulla Griffiths
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Affiliation Department of Global Health and Development, London School of Hygiene and Tropical Medicine (LSHTM), London, United Kingdom
- Fiammetta Bozzani
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Affiliation Department of Global Health and Development, London School of Hygiene and Tropical Medicine (LSHTM), London, United Kingdom
- Musonda Mumba
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Affiliation Lusaka Eye Hospital, Lusaka, Zambia
- Joseph Munsanje
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Affiliation S & S Development Consultants, Lusaka, Zambia
Competing Interests
One author is currently employed by S&S Development Consultants; however, at the time of the data collection he was employed by Sightsavers International (the funding agency) to oversee the survey. Since working for S&S Development Consultants he has commented on the draft paper. This does not alter the authors’ adherence to all the PLoS ONE policies on sharing data and materials.
Author Contributions
Conceived and designed the experiments: RL JM. Performed the experiments: RL MM. Analyzed the data: RL UG FB JM. Wrote the paper: RL UG FB MM JM.