1. The effect of pupil size on visual acuity in uncorrected and corrected myopia;Atchison;Am. J. Optom. Physiol. Opt.,1979
2. Optical characteristics of Bausch and Lomb Soflens (PA1) bifocals: Internat;Charman;Contact Lens Clinic,1984
3. Bifocal and multifocal contact lenses;de Carle,1981
4. A clinical evaluation of the ALGES (hefilcon A) bifocal contact lens;Gross;Can. J. Optom.,1985
5. A design study of bifocal contact lenses;Hodd;Opthalmic Optician,1969