title: A definition of progressive power in ophthalmic lenses.
abstract: Practitioners may now prescribe several progressive addition lenses. This article discusses and compares some individual progressive addition lenses available in America with regard to the important aspect of intermediate area vision, lateral boundaries and lateral distortions. Included are tips for comparing the wearability of different brands of lenses from viewing photographs of uniform grids as seen through the various progressive addition lenses.
mesh_terms: D005139:Eyeglasses / Q000592:standards*; D006801:Humans; D011305:Presbyopia / Q000628:therapy*; D012030:Refractive Errors / Q000628:therapy*