1. From the Visual Impairment Research Group, School of the Built Environment, Heriot-Watt University, and the2Princess Alexandra Eye Pavilion, Edinburgh, Scotland, United Kingdom; the
2. Department of Ophthalmology, University of Aberdeen, Scotland, United Kingdom; and
3. From the Visual Impairment Research Group, School of the Built Environment, Heriot-Watt University, and the
4. Adelphi Group Ltd., Bollington, United Kingdom.