title: A comparative evaluation of Readables to single vision lenses.
abstract: Emmetropic presbyopes are often prescribed single vision lenses for near or intermediate work. These lenses limit the usable range of clear vision especially in advanced presbyopia. Readables, a special purpose PAL that emphasizes intermediate and near vision extends the usable range by providing appropriately changing power over the middle 28 millimeters of the lens. A crossover design, randomized controlled clinical trial was undertaken to determine if Readables were perceived to provide better function than the single vision reading lens. Readables were preferred by a ratio of 25:2 and scored significantly better in lens performance measures. The design benefits of Readables are appreciated by the presbyopic patient.
authors.forename: R A
authors.initials: RA
authors.lastname: Krefman
mesh_terms: D000328:Adult; D005069:Evaluation Studies as Topic; D005139:Eyeglasses; D006801:Humans; D008875:Middle Aged; D055095:Optics and Photonics; D011305:Presbyopia / Q000628:therapy*; D011932:Reading