- Dr Russell Watkins, Department of Optometry, Anglia Polytechnic University, East Road, Cambridge CB1 1PT, UK
- Accepted February 14, 2001
- First published July 1, 2001.
If you wish to reuse any or all of this article please use the link below which will take you to the Copyright Clearance Center’s RightsLink service. You will be able to get a quick price and instant permission to reuse the content in many different ways.