1. Atkinson, T.C.O. Personal communication.
2. You Can Fit That Presbyope;Bayshore;Contact Lens Forum,1977
3. Presbyopic Patients and Single Vision Contact Lenses;Beddow;Southern Journal Optom.,1966
4. Prescribing for Presbyopia With Contact Lenses;Bier;The Ophthalmic Optician Journal,1965
5. Bifocal Contact Lenses;Borish;Journal Am. Optom. Assoc.,1982