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  • Title: A comparative evaluation of Readables to single vision lenses.
    Author: Krefman RA.
    Journal: J Am Optom Assoc; 1991 Sep; 62(9):676-9. PubMed ID: 1815001.
    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.
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