85
Participants
Start Date
December 31, 2006
Primary Completion Date
July 31, 2010
Study Completion Date
July 31, 2010
progressive addition spectacle lens (bifocal)
Progressive addition lenses (PAL) with a +2.00 D add.
Single Vision Lenses (SVLs)
Single vision spectacle lenses.
The Ohio State University College of Optometry, Columbus
National Eye Institute (NEI)
NIH
Ohio State University
OTHER