1. United Kingdom National Statistics. Age Structure. Accessed at: www.statistics.gov.uk/cci/nugget.asp?id=1308 on April 6, 2009.
2. Contact lens practice;Meyler,2002
3. A decade of contact lens prescribing trends in the United Kingdom (1996–2005);Morgan;Contact Lens Ant Eye,2006
4. The ACLM contact lens year book 2008;Kerr,2008