1. The history of contact lenses;Lamb,2007
2. The College of Optometrists. Code of ethics and guidelines for professional conduct. Care of and refitting contact lens wearers. April 2009, www.college-optometrists.org/index.aspx/pcms/site.publication.Ethics_Guidelines.Ethics_Guidelines_home/.
3. Superficial punctate staining of the ocular surface;Ward;Optom Vis Sci,2008
4. Andrasko G. www.staininggrid.com.
5. Bausch & Lomb. www.thetruthaboutstaininggrid.com.