1. Contact Lens Practice;Douthwaite,1987
2. Optical characteristics of Bausch and Lomb Soflens (PA1) bifocals;Charman;Int. Contact Lens Clin.,1984
3. Optical properties and patient acceptance of the Nissel PS45 presbyopic lens: a preliminary study;Charman;Optometry Today,1988
4. Theoretical and practical factors influencing the optical performance of contact lenses for the presbyope;Charman;J. Br. Contact Lens Assoc.,1990
5. Power distribution across a back-surface aspheric, rigid multifocal contact lens;Buckingham;Int. Contact Lens Clin.,1982