1. Eye changes after forty;Abrahamson;Am Family Physician,1984
2. Presbyopia in Nigerians;Adefule;East African Med J,1983
3. Questioning our classical understanding of accommodation and presbyopia;Adler-Grinberg,1987
4. Eye and head contribution to gaze at near through multifocals: the usable field of view;Afanador;Am J Optom Physiol Opt,1986
5. The influence of age on the speed of accommodation;Allen;Am J Optom,1956