Date of Award
Master of Science in Vision Science
John R. Roggenkamp
A randomly selected clinic population (n=18) of emmetropes and contact lens wearing presbyopes was fit with the Alpha"D" progressive additions lens. Subjects were asked to wear the lens for three weeks then respond to a questionnaire assessing adaptation, visual acuity, visual comfort, and acceptability of the Alpha"D" lens. Subjects reported early adaptation, minor symptomatology, and an overall feeling of visual comfort with the lens. Distortion was reported as a problem as well as difficulty when utilized for desk work. Subject preference between the Alpha"D" lens and previous lens forms (bifocals, hair eyes, and progressive addition lenses) was mixed, finding 50% preferring the Alpha"D" lens over their original form.
Nakano, Mark E. and Benner, Ronald L., "A clinical evaluation of the Alpha "D" progressive addition lens" (1986). College of Optometry. 152.