1. Research in orthokeratology. Part I: introduction and background;Kerns;J Am Optom Assoc,1976
2. Orthokeratology: principles and practice;Mountford,2004
3. Contact lenses and the progression of myopia;Morrison;Australas J Optom,1957
4. Orthofocus techniques;Jessen;Contacto,1962
5. Flashback: the first ortho-k meeting;Nolan;Contacto,1995