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Trail of trial lenses
  1. Richard Keeler,
  2. Arun D Singh,
  3. Harminder S Dua

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    Courtesy of Mr Richard Keeler, Curator, museum of the Royal College of Ophthalmologists, London. Photo: Mark Thomas

    The itinerant spectacle seller was using trial lenses in the form of pairs of lenses held in a frame as early as the 17th century. In 1838 …

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