1. Orthofocus techniques;Jessen;Contacto,1962
2. Research in orthokeratology. Part III: results and observations;Kerns;J Am Optom Assoc,1976
3. The Berkeley orthokeratology study. Part I: general conduct of the study;Brand;Am J Optom Physiol Opt,1983
4. Orthokeratology: Part II: evaluating the Tabb method;Coon;J Am Optom Assoc,1984
5. Predicting stable changes in orthokeratology;Freeman;Contact Lens Forum,1978