1. Research in ortho-K. Part I: introduction and background;Kerns;J Am Optom Assoc,1976
2. Ortho-K: principles and practice;Mountford,2004
3. CLes and the progression of myopia;Morrison;Australas J Optom,1957
4. Flashback: the first ortho-k meeting;Nolan;Contacto,1995
5. Research in ortho-K. Part III: results and observations;Kerns;J Am Optom Assoc,1976